Epochs of the cenozoic era

The Paleogene is further subdivided into the Paleocene, Eocene, and Oligocene epochs, while the Neogene consists of the Miocene, Pliocene, Pleistocene, and Holocene …

Cenozoic Era - Mammals, Plants, Climate: Cenozoic life was strikingly different from that of the Mesozoic. The great diversity that characterizes modern-day flora is attributed to the explosive expansion and adaptive radiation of the angiosperms (flowering plants) that began during the Late Cretaceous. As climatic differentiation increased over the course of the Cenozoic, flora became more and ... This epoch marks the beginning of the Cenozoic era and the tertiary period. The Eocene Epoch (second epoch of the tertiary period) lasted from about 55.8 to 33.9 million years ago. The. Oligocene Epoch (third epoch of the tertiary period) lasted from about 33.9 to 23 million years ago. The Miocene Epoch (fourth epoch of the tertiary period ...With talent from the most respected names in tech, ClickUp's executive bench is poised to take on the next era of workforce transformation SAN DIE... With talent from the most respected names in tech, ClickUp's executive bench is poised to ...Pouting, posing and challenging narratives, nearly a century ago. Just like Instagrammers today challenge the stereotypes of Africa in the digital era, the black and white film photography of Mama Casset used the tools of the colonial era t...Quaternary, in the geologic history of Earth, a unit of time within the Cenozoic Era, beginning 2,588,000 years ago and continuing to the present day. The Quaternary has been characterized by several periods of glaciation (the “ice ages” of common lore), when ice sheets many kilometres thick haveThe Epoch Times is a widely recognized newspaper that has gained significant influence within Chinese communities worldwide. With its unique approach to news reporting and commitment to uncovering the truth, it has become a trusted source o...

Species changed as the epochs of the Cenozoic Era rolled by, with the mammals eventually becoming the largest land animals of the Era, as the dinosaurs had been during the Mesozoic. Flowering plants strongly influenced the evolution of both birds and herbivors throughout the Cenozoic era by providing a rich abundance of food. In biological anthropology, we are specifically focused on the late Mesozoic/early Cenozoic eras in relation to primate evolution. You should be familiar with the time ranges for the epochs of the Cenozoic. Below you will learn about …extinct by the end of this epoch. Tertiary Period: Pliocene, Miocene, Oligocene, Eocene, and Paleocene Epochs. Time. Geologic Development. Life Forms. Pliocene.Neogene Period, the second of three divisions of the Cenozoic Era. The Neogene Period encompasses the interval between 23 million and 2.6 million years ago and includes the Miocene and the Pliocene epochs. Learn more about the Neogene Period in this article. Search …Pliocene Epoch, In geologic time , the Pliocene Epoch occurs during the Tertiary Period (65 million years ago [mya] to 2.6 mya) of the Cenozoic Era of the Phanerozoi… Jurassic Period , In geologic time , the Jurassic Period—the middle of three geologic periods in the Mesozoic Era—spans the time from roughly 206–208 million years ago…The Cenozoic is really the only era divided into epochs because a lot happened in a relatively short amount of time. The Earth cooled drastically and mammals rapidly grew and diversified into all ...

Quaternary. The Cenozoic era, 65 million years ago to the present, is divided into two periods, the Tertiary and the Quaternary.The Tertiary period, 65 to 2 million years ago, encompasses the rebuilding of the animal kingdom at the end of the great Cretaceous extinction.From an unpromising beginning as small, nocturnal opportunists, mammals, …The initial epoch of the Paleogene Period and the Cenozoic Era is the Paleocene Epoch, which marks the first subdivision of geologic time after the extinction of the dinosaurs and the end of the Cretaceous Period. In western North America, the uplift of the Rocky Mountains, which started in the Cretaceous, continued throughout the Paleocene.Periods of the Cenozoic Era are split into even smaller parts known as Epochs, so you will see even more signposts in this Era. Cenozoic signposts are colored yellow. Cenozoic | U.S. Geological Survey Skip to main content An official website of the United States government Here's how you know Here's how you know Official websites use .govThe Eocene epoch is part of the Tertiary Period in the Cenozoic Era, and lasted from about 54.8 to 33.7 million years ago (mya). The oldest known fossils of most of the modern orders of mammals appear in a brief period during the Early Eocene and all were small, under 10 kg. Both groups of modern ungulates ( Artiodactyla and Perissodactyla ...To memorize the Epochs of Cenozoic Era: Paleocene, Eocene, Oligocene, Miocene, Pliocene, Pleistocene, Holocene (or Recent): Pretty Eager Old Men Play Poker Hard. Pigeon Egg Omelets Make People Puke Heartily. Put Eggs On My Plate Please Homer. The missing Era: Precambrian Archean, Proterozoic

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Epoch in the Cenozoic Era Crossword Clue. The Crossword Solver found 30 answers to "Epoch in the Cenozoic Era", 6 letters crossword clue. The Crossword Solver finds answers to classic crosswords and cryptic crossword puzzles. Enter the length or pattern for better results. Click the answer to find similar crossword clues . Enter a Crossword Clue.divisible into periods, epochs and ages. The various divisions of geologic time, along with their ages, and the position of Cenozoic in it are depicted in Table 1. 6.2 CHRONOLOGY OF CENOZOIC ERA From an anthropological perspective, Cenozoic Era is …The Tertiary Period: The Age Of Mammals Begins The Tertiary Period Is the old name given to the first period of the Cenozoic Era.It is no longer an official term and has been replaced by the Paleogene Period for the first 3 Epochs while the next 2 now belong to the Neogene Period.It may be a little confusing and why change the name anyway?Generally, the eras used to describe the modern Earth are the Quaternary geological era and the Cenozoic evolutionary era. In the future, there may also be a historical era that the current time period, the 21st century, will belong to.10 ส.ค. 2566 ... It is part of the Cenozoic Era, along with the Quarternary Period. User Avatar. Wiki User. ∙ 8y ago. This answer is:.also spelled: Palaeogene Period. Paleogene Period, also spelled Palaeogene Period, oldest of the three stratigraphic divisions of the Cenozoic Era spanning the …

The Paleogene Period is the first of two periods which make up the Cenozoic Era. ... The Paleogene period, its epochs, the the two Neogene epochs Miocene and ...The Cenozoic spans only about 65 million years, from the end of the Cretaceous and the extinction of non-avian dinosaurs to the present. The Cenozoic is sometimes called the …Periods of the Cenozoic Era are split into even smaller parts known as Epochs, so you will see even more signposts in this Era. Are we in the Cenozoic Era? The Cenozoic era, which began about 65 million years ago and continues into the present, is the third documented era in the history of Earth. The current locations of the continents and ...The Cenozoic, the most recent major interval of geologic time (i.e., the past 66 million years), is commonly divided into the Paleogene, Neogene, and Quaternary periods. The Paleogene and Neogene (about 66 to 2.6 million years ago) are remarkable for their great tectonic movements, which resulted in the Alpine orogeny.During that mountain-building episode, the Atlas Mountains of northwestern ...With talent from the most respected names in tech, ClickUp's executive bench is poised to take on the next era of workforce transformation SAN DIE... With talent from the most respected names in tech, ClickUp's executive bench is poised to ...The epochs of the Cenozoic era correspond roughly to the appearance of forms that have the features that define the main primate families. An easy way to remember both the epochs of the Cenozoic and the order of primate evolution is to think in terms of the ancestral and derived primate features that we studied in Lab 5 on Primate Taxonomy.This epoch marks the beginning of the Cenozoic era and the tertiary period. The Eocene Epoch (second epoch of the tertiary period) lasted from about 55.8 to 33.9 million years ago. The. Oligocene Epoch (third epoch of the tertiary period) lasted from about 33.9 to 23 million years ago. The Miocene Epoch (fourth epoch of the tertiary period ...Miocene Epoch (23.03–5.332 Ma) The Miocene comprised most of the Neogene Period making it the second longest Epoch of the Cenozoic Era. Wide expanses of grasslands formed across the Northern Hemisphere and supported a variety of new types of mammals. Horses moved from browsing in forests and meadows to grazing (eating grass) in grasslands. Click on a subdivision of the Cenozoic to visit its exhibit! The chart at left shows the several subdivisions of the Cenozoic Era. After the column labelled "Cenozoic", the next column shows the two periods, the Tertiary and the Quaternary.The Tertiary Period is subdivided into the Paleogene and the Neogene, though we have not created exhibits for these …Primate-like Mammals. The first primate-like mammals, or proto-primates , evolved in the early Paleocene Epoch (65.5-55.8 million years ago) at the beginning of the Cenozoic Era. They were roughly similar to squirrels and tree shrews in size and appearance. The existing, very fragmentary fossil evidence (from Asia, Europe, North Africa, and ...The Cenozoic Era, the 66.6 million years of earth’s history, holds the evolutionary secrets of all life on earth today. Stacked below the earth’s crust, each layer unfolds stories about the formation of continents, mountains, climatic zones, unimaginable glaciation cycles, the evolution of the mighty Indricotherium, majestic woolly mammoth, …Earth Sciences questions and answers. Geologists use epochs to further divide geologic eras and periods. Put the following epochs from the Cenozoic Era in chronological order, from the earliest to the most recent. tems in order Items (5 items) Drag and drop into the appropriate area) Youngest Pliocene Paleocene Eocene 2 Miocene Oligocene.

The Cenozoic Era spans the interval from 66 million years ago to present. It is divided into the Paleogene Period (66–23 million years ago) and Neogene Period (23 million years ago to present). The Paleogene is further subdivided into the Paleocene, Eocene, and Oligocene epochs, while the Neogene consists of the Miocene, Pliocene, Pleistocene ...

Started at the end of the Cretaceous Period. Contains two periods: Tertiary Period and Quaternary Period. epochs. Tertiary Period and Quaternary Period are further divided into ____. Holocene. The most recent epoch, the _____ began 10,000 years ago. You are living in this epoch. mammals. ____ dominated the landscape during the Cenozoic Period.Paleozoic era cenozoic-Geomorhology Chapter Kaium Chowdhury 975 views•14 slides. The Geologic Time Scale (Chronological Order) Central Mindanao University 18.1K views•30 slides. Paleozoic Era Russen Charlotte 14.5K views•95 slides.Paleogene Period. Learn about the time period that took place 65 to 23 million years ago. At the dawn of the Paleogene—the beginning of the Cenozoic era—dinosaurs, pterosaurs, and giant marine ...* The Eocene epoch (56-34 million years ago) was the longest epoch of the Cenozoic Era. The Eocene witnessed a vast profusion of mammalian forms; this was when the first even- and odd-toed ungulates appeared on the planet, as well as the first recognizable primates.The Cenozoic Timescale and Paleogeography. This chart at the left shows the subdivisions of the Cenozoic Era. The Cenozoic spans an interval of time from 65 million years ago until the present. The era is divided into two periods, the Paleogene and the Neogene. These, in turn, are subdivided into shorter intervals of time called epochs.Pleistocene Epoch, earlier and major of the two epochs that constitute the Quaternary Period of Earth’s history, an epoch during which a succession of glacial and interglacial climatic cycles occurred. The base of the Gelasian Stage (2,588,000 to 1,800,000 years ago) marks the beginning ofShould you follow the adage "sell in May and go away?" Peter Tchir, managing director at Brean Capital, said the equities adage "sell in May and go away" applies in the Trump era. "I think you want to be out of anything th...The age of mammals, the cenozoic, has been split into seven epochs. Those seven epochs are as follows: Paleocene Eocene Oligocene Miocene Pliocene Pleistocene Holocene Paleocene ~ 65-56 Million Years Ago The comet or meteor hit and the dinosaurs, except the birds, were wiped out roughly 65 million years ago.

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The Epoch Times is a global media outlet that provides news, opinion, and entertainment from around the world. It is one of the most popular news sources in the world, and its homepage is a great way to stay informed about current events. H...The Cenozoic era is divided into two periods, the Paleogene and Neogene, and they in turn are divided into epochs. The Paleogene period comprises the Paleocene, Eocene, and Oligocene epochs, and the Neogene comprises the Miocene, Pliocene, Pleistocene, and Holocene epochs, the last of which is ongoing.The Cenozoic Era began around 65 million years ago, when the dinosaurs from the Mesozoic Era all became extinct, and has not yet ended. Because 65 million years is a large amount of time, the...Neogene Period, the second of three divisions of the Cenozoic Era. The Neogene Period encompasses the interval between 23 million and 2.6 million years ago and includes the Miocene and the Pliocene epochs. Learn more about the Neogene Period in this article. Each period is further divided into epochs: the Paleogene encompasses the Paleocene, Eocene, and Oligocene epochs; the Neogene comprises the Miocene and Pliocene epochs; and the Quaternary includes the Pleistocene and Holocene epochs. This article provides an overview of the Cenozoic Era and the major events that occurred during its span. The Oligocene epoch is part of the Tertiary Period in the Cenozoic Era, and lasted from about 33.7 to 23.8 million years ago (mya). The Oligocene is thus a relatively short span of time, though a number of major changes occurred during this time. These include the appearance of the first elephants with trunks, early horses, and the appearance ...Cenozoic Era, third of the major eras of Earth's history, beginning about 66 million years ago and extending to the present. ... The Neogene spans the Miocene and Pliocene epochs, and the Quaternary includes the Pleistocene and Holocene epochs. Geologic processes. Cenozoic rocks are extensively developed on all the continents, particularly on ...quaternary. quat·er·nar·y / ˈkwätərˌnerē / • adj. 1. fourth in order or rank; belonging to the fourth order. 2. (Quaternary) Geol. of, relating to, or denoting the most recent period in the Cenozoic era, following the Tertiary period and comprising the Pleistocene and Holocene epochs (and thus including the present). 3.Generally, the eras used to describe the modern Earth are the Quaternary geological era and the Cenozoic evolutionary era. In the future, there may also be a historical era that the current time period, the 21st century, will belong to.Oligocene age fossil oreodont skull, Badlands National Park, South Dakota. NPS image. Introduction. Geologists have traditionally divided the Cenozoic Era into two periods: Tertiary and Quaternary, with …To make geologic time easier to comprehend, geologists divided the 4.6 billion years of Earth’s history into units of time called eons. Then they further divided the eons into two or more eras, eras into two or more periods, periods into two or more epochs, and epochs into two or more ages. These units are called geochronologic units, (geo ...From hominids, humans evolved in the last 4 million years of the Cenozoic era. 1. The dinosaurs went extinct. Ultimately, the start of the Cenozoic Era was the demise of dinosaurs. After a 6-mile wide asteroid hit Earth 66 million years ago, a dust cloud blocked the sun. It was the Cretaceous–Paleogene (K-Pg) extinction event that wiped out ... ….

The Epoch Times is a widely recognized newspaper that has gained significant influence within Chinese communities worldwide. With its unique approach to news reporting and commitment to uncovering the truth, it has become a trusted source o...The further subdivision of the eras into 12 "periods" is based on identifiable but less profound changes in life-forms. In the most recent era, the Cenozoic, there is a further subdivision of time into epochs.The Cenozoic Timescale and Paleogeography. This chart at the left shows the subdivisions of the Cenozoic Era. The Cenozoic spans an interval of time from 65 million years ago until the present. The era is divided into two periods, the Paleogene and the Neogene. These, in turn, are subdivided into shorter intervals of time called epochs. Cenozoic. Cenozoic (66 million years ago until today) means ‘recent life.’. During this era, plants and animals look most like those on Earth today. Periods of the Cenozoic Era are split into even smaller parts known as Epochs, so you will see even more signposts in this Era. Cenozoic signposts are colored yellow.Primates (both non-human and human) evolved during the Cenozoic Era (aka "the Age of the Mammals"). The Cenozoic Era (65 m.y.a to present) divided into epochs, which are sub-divisions of a geological period. Which epoch is associated with the evolution/adaptive radiation of the genus Homo a. Pleistocene (1.8 m.y.a 10,000 ya) b. Eocene (53-38 m.y.a)Periods of the Cenozoic Era Smilodon and mammoth evolved during the Cenozoic Era. Getty/Dorling Kindersley Our current Era in the Geologic Time Scale is called the Cenozoic Era. Compared to all of the other Eras throughout the history of the Earth, the Cenozoic Era has been relatively short so far.Neogene Period, the second of three divisions of the Cenozoic Era. The Neogene Period encompasses the interval between 23 million and 2.6 million years ago and includes the Miocene and the Pliocene epochs. Learn more about the Neogene Period in this article.Paleogene period (65-23 million years ago), which consists of the Paleocene, Eocene and Oligocene epochs); Neogene period (23-2.6 million years ago), which includes the Miocene and Pliocene...The Neogene Period is the middle period of the three periods of the Cenozoic Era. Like the other periods of the Cenozoic, it is geologically short (less than 1% of geologic time) but well-represented at the surface. Neogene sedimentary formations are often poorly lithified, because they are young and generally have not been deeply buried.Epoch in the Cenozoic Era Crossword Clue. The Crossword Solver found 30 answers to "Epoch in the Cenozoic Era", 6 letters crossword clue. The Crossword Solver finds answers to classic crosswords and cryptic crossword puzzles. Enter the length or pattern for better results. Click the answer to find similar crossword clues . Enter a Crossword Clue. Epochs of the cenozoic era, The Geologic Time Scale shows the names of all of the eons, eras, and periods throughout geologic time, along with some of the epochs. (The time scale is simplified to include just the most commonly used unit names, so epochs before the Cenozoic Era and ages aren't listed.) , Cenozoic. Cenozoic (66 million years ago until today) means ‘recent life.’. During this era, plants and animals look most like those on Earth today. Periods of the Cenozoic Era are split into even smaller parts known as Epochs, so you will see even more signposts in this Era. Cenozoic signposts are colored yellow. , 4 ก.ย. 2555 ... The Cenozoic Era is divided into two periods, the Paleogene and Neogene, and they are in turn divided into epochs. ... The Cenozoic Era has been a ..., Study with Quizlet and memorize flashcards containing terms like During which of the following do you live? a. The Cenozoic Era b. The Phanerozoic Eon c. The Holocene Epoch d. all of the above, There were so many animals without backbones in the Early Paleozoic that it is often called ________. a. the boneless period b. the vertebrate era c. the age of the invertebrates. d. the age of the ..., Cenozoic Era is the last geologic period and is often referred as the age of mammals. It is thought to begin 65 million years ago and continued till present. The name Cenozoic means new life. With the destruction and perish of dinosaurs by the end of the Cretaceous period, this era has set the stage for the rising and abundance of mammals ..., Study with Quizlet and memorize flashcards containing terms like During the Miocene epoch of the Cenozoic era, there was an adaptive radiation of which kind of primate? a. prosimians b. apes c. monkeys d. humans, Which fossil group is characterized by an eye orbit fully enclosed by bone? a. anthropoids b. plesiadapiforms c. adapids d. omomyids, Monkeys underwent massive _______ in the Pliocene ... , Quaternary Period (2.6 million years ago to present) Glaciers of the Pleistocene Epoch (2.6 million years ago to 11,700 years ago) reached northeast Kansas at least twice, leaving behind unsorted clay, sand, gravel, and boulders. Quartzite boulders, picked up by the glaciers far to the north and deposited in Kansas as the ice retreated, are ... , The Periods and Epochs of the Cenozoic Era The Paleogene period (65-23 million years ago) was the age when the mammals began their rise to dominance. The Paleogene comprises three separate epochs:, Species changed as the epochs of the Cenozoic Era rolled by, with the mammals eventually becoming the largest land animals of the Era, as the dinosaurs had been during the Mesozoic. Flowering plants strongly influenced the evolution of both birds and herbivors throughout the Cenozoic era by providing a rich abundance of food. , Earth Sciences Cenozoic era. The Cenozoic era was the third major epoch of earth's history, beginning approximately 66 million years ago and extending to the present. It was the time interval during which the continents assumed their modern configuration and the different geographical positions they hold to this day, and during which the earth's flora and fauna evolved to the present day. , Tertiary Period, former official interval of geologic time lasting from approximately 66 million to 2.6 million years ago. It is the traditional name for the first of two periods in the Cenozoic Era (66 million years ago to the present); the second is the Quaternary Period (2.6 million years ago to the present)., The Cenozoic Era was initially referred to as the third and fourth periods. These two periods are still called the Tertiary and Quaternary. The Quaternary period is composed of our present epoch …, Nov 18, 2016 · Paleozoic era cenozoic-Geomorhology Chapter Kaium Chowdhury 975 views•14 slides. The Geologic Time Scale (Chronological Order) Central Mindanao University 18.1K views•30 slides. Paleozoic Era Russen Charlotte 14.5K views•95 slides. , 30 พ.ค. 2566 ... ... epochs in Cenozoic era. Each prefix provides an indication of the time period to which the epoch belongs. Here's a breakdown of their ..., The Cenozoic Timescale and Paleogeography. This chart at the left shows the subdivisions of the Cenozoic Era. The Cenozoic spans an interval of time from 65 million years ago until the present. The era is divided into two periods, the Paleogene and the Neogene. These, in turn, are subdivided into shorter intervals of time called epochs., Oligocene age fossil oreodont skull, Badlands National Park, South Dakota. NPS image. Introduction. Geologists have traditionally divided the Cenozoic Era into two periods: Tertiary and Quaternary, with …, The Cenozoic Timescale and Paleogeography. This chart at the left shows the subdivisions of the Cenozoic Era. The Cenozoic spans an interval of time from 65 million years ago until the present. The era is divided into two periods, the Paleogene and the Neogene. These, in turn, are subdivided into shorter intervals of time called epochs. , Earth Sciences Cenozoic era. The Cenozoic era was the third major epoch of earth's history, beginning approximately 66 million years ago and extending to the present. It was the time interval during which the continents assumed their modern configuration and the different geographical positions they hold to this day, and during which the earth's flora …, Started at the end of the Cretaceous Period. Contains two periods: Tertiary Period and Quaternary Period. epochs. Tertiary Period and Quaternary Period are further divided into ____. Holocene. The most recent epoch, the _____ began 10,000 years ago. You are living in this epoch. mammals. ____ dominated the landscape during the Cenozoic Period., Cenozoic. Cenozoic (66 million years ago until today) means ‘recent life.’. During this era, plants and animals look most like those on Earth today. Periods of the Cenozoic Era are split into even smaller parts known as Epochs, so you will see even more signposts in this Era. Cenozoic signposts are colored yellow., Miocene Epoch (23.03–5.332 Ma) The Miocene comprised most of the Neogene Period making it the second longest Epoch of the Cenozoic Era. Wide expanses of grasslands formed across the Northern Hemisphere and supported a variety of new types of mammals. Horses moved from browsing in forests and meadows to grazing (eating grass) in grasslands. , Mar 2, 2021 · The Cenozoic Era, the 66.6 million years of earth’s history, holds the evolutionary secrets of all life on earth today. Stacked below the earth’s crust, each layer unfolds stories about the formation of continents, mountains, climatic zones, unimaginable glaciation cycles, the evolution of the mighty Indricotherium, majestic woolly mammoth, and the unbeatable human race from the small ... , , The Cenozoic era is divided into two periods, the Paleogene and Neogene, and they in turn are divided into epochs. The Paleogene period comprises the Paleocene, Eocene, and Oligocene epochs, and the Neogene comprises the Miocene, Pliocene, Pleistocene, and Holocene epochs, the last of which is ongoing., Although astronomers and geologists use the word “eon” to mean 1 billion years, it is more commonly used to refer to any long, indefinite period of time. Like the words “age,” “epoch” and “era,” it does not refer to a set number of years., The Neogene Period is the middle period of the three periods of the Cenozoic Era. Like the other periods of the Cenozoic, it is geologically short (less than 1% of geologic time) but well-represented at the surface. Neogene sedimentary formations are often poorly lithified, because they are young and generally have not been deeply buried., Right now, according to the current timeline, we are in — deep breath — the Meghalayan Age of the Holocene Epoch of the Quaternary Period of the Cenozoic Era of the Phanerozoic Eon, and have ..., Cenozoic Era is the last geologic period and is often referred as the age of mammals. It is thought to begin 65 million years ago and continued till present ..., By dividing the Cenozoic Era into three (arguably two) periods (Paleogene, Neogene, Quaternary) instead of seven epochs, the periods are more closely comparable to the …, Cenozoic Era: Stratigraphy. The Cenozoic is divided into two main sub-divisions: the Tertiary and the Quaternary. Most of the Cenozoic is the Tertiary, from 65 million years ago to 1.8 million years ago. The Quaternary includes only the last 1.8 million years. The concepts of Tertiary and Quaternary have an interesting history., During the Cenozoic era epochs, life on land continued to evolve and diversify. Birds, flowering plants, and mammals flourish on the planet. The Cenozoic era includes the present time and is the ..., Periods of the Cenozoic Era are split into even smaller parts known as Epochs, so you will see even more signposts in this Era. Cenozoic signposts are colored yellow. Cenozoic | U.S. Geological Survey Skip to main content An official website of the United States government Here's how you know Here's how you know Official websites use .gov, Oct 30, 2012 · Salix sp. leaf. Liquidambar sp. seed pod. The Paleogene Period* is the first of three periods comprising the Cenozoic Era. The Cenozoic, sometimes known as the "Age of Mammals", as the Mesozoic was the "Age of Reptiles", is known by its Epochs. The Paleogene is composed of the first three of these Epochs, (Paleocene, Eocene, and Oligocene Epochs).