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. What can we notice about the complexity of the fossils as we move through the Geologic Time Scale from the Precambrian Times to Quarternary Period? What can we conclude from observing?

. What can we notice about the complexity of the fossils as we move through the Geologic Time Scale from the Precambrian Times to Quarternary Period? What can we conclude from observing?

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
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ANSWER THE FOLLOWING QUESTION.

1. What can we notice about the complexity of the fossils as we move through the Geologic Time Scale from the Precambrian Times to Quarternary Period? What can we conclude from observing? 

The Geologic Time Scale Reference Table Millions of Era Period Major Events Years Ago 4600 - Fossils extremely rare. Anaerobic heterotrophic prokaryotes appear 3.5 billion years ago. Photosynthetic prokaryotes appear 3.0 billion years ago. First aerobic eukaryotic cells appear 2.0 billion years ago. Multicellular algae appear 1.2 billion years ago. Additional multicellular forms quickly follow. Life existed only on the seas. Precambrian 540 540 540 - The "Cambrian Explosion" brings great diversity in invertebrate life. Life includes: (1) Soft-bodied jellyfish, worms, and sponges, (2) Brachiopods with two-shells similar to clams, and (3) Trilobites (arthropods) are dominant. Cambrian 245 510 Diverse marine invertebrates are dominant. Ancestors of modern octopi and squid appear. First primitive jawless fish are present. Ordovician 430 Jawless fish are abundant. Jawed fish appear. First colonization of land by arthropods and vascular plants, such as Silurian ferns. Paleozoic 400 Called the "Age of Fishes" because of abundant and diverse forms in the seas. Ferns and horsetails are present on land, as well as wingless insects and arachnids. First amphibians appear. Devonian 360 Rich deposits of coal are formed. First seed plants appear. Appearance of amniote egg in early reptiles. Abundant sharks, amphibians, and winged insects. Carboniferous 285 Largest mass extinction in Earth's history. 95% of marine species disappear. On land, gymnosperms and conifers are dominant. Permian 245 Survivors of the largest mass extinction spread and colonize new areas. The super-continent Pangaea alters climates and ocean circulation. Earliest dinosaurs appear. Cycads and conifers are dominant plant life. Early rodent-like mammals are present in late Triassic. 245 - Triassic 65 200 Dinosaurs rule the Earth as the dominant animal life on land. Some reptiles develop bird-like characteristics leading to the evolution of birds. Pangaea begins to break apart. First angiosperms appear on land. Mesozoic Jurassic 140 Dinosaurs are dominant early in this period, but in another mass extinction at the end of this period, 50% of all plant and animal species become extinct, including the dinosaurs. Angiosperms are dominant. Break up of Pangaea continues. Cretaceous 65 65 - Angiosperms and insects flourish. Earliest placental mammals. Rapid evolution seen in mammals includes large Tertiary grazing mammals and marine mammals. Earth's climate is warm and mild. present 2.0 Cenozoic Climate cools leading to a series of ice ages at the beginning of this period. Mastodons, mammoths, and large carnivores appear. Earliest humans appear 4.5 million years ago, and Homo sapiens appear 200,000 years ago. 20,000 years ago Earth's climate began to warm. Quaternary Copyright © Amy Brown Science
Transcribed Image Text:The Geologic Time Scale Reference Table Millions of Era Period Major Events Years Ago 4600 - Fossils extremely rare. Anaerobic heterotrophic prokaryotes appear 3.5 billion years ago. Photosynthetic prokaryotes appear 3.0 billion years ago. First aerobic eukaryotic cells appear 2.0 billion years ago. Multicellular algae appear 1.2 billion years ago. Additional multicellular forms quickly follow. Life existed only on the seas. Precambrian 540 540 540 - The "Cambrian Explosion" brings great diversity in invertebrate life. Life includes: (1) Soft-bodied jellyfish, worms, and sponges, (2) Brachiopods with two-shells similar to clams, and (3) Trilobites (arthropods) are dominant. Cambrian 245 510 Diverse marine invertebrates are dominant. Ancestors of modern octopi and squid appear. First primitive jawless fish are present. Ordovician 430 Jawless fish are abundant. Jawed fish appear. First colonization of land by arthropods and vascular plants, such as Silurian ferns. Paleozoic 400 Called the "Age of Fishes" because of abundant and diverse forms in the seas. Ferns and horsetails are present on land, as well as wingless insects and arachnids. First amphibians appear. Devonian 360 Rich deposits of coal are formed. First seed plants appear. Appearance of amniote egg in early reptiles. Abundant sharks, amphibians, and winged insects. Carboniferous 285 Largest mass extinction in Earth's history. 95% of marine species disappear. On land, gymnosperms and conifers are dominant. Permian 245 Survivors of the largest mass extinction spread and colonize new areas. The super-continent Pangaea alters climates and ocean circulation. Earliest dinosaurs appear. Cycads and conifers are dominant plant life. Early rodent-like mammals are present in late Triassic. 245 - Triassic 65 200 Dinosaurs rule the Earth as the dominant animal life on land. Some reptiles develop bird-like characteristics leading to the evolution of birds. Pangaea begins to break apart. First angiosperms appear on land. Mesozoic Jurassic 140 Dinosaurs are dominant early in this period, but in another mass extinction at the end of this period, 50% of all plant and animal species become extinct, including the dinosaurs. Angiosperms are dominant. Break up of Pangaea continues. Cretaceous 65 65 - Angiosperms and insects flourish. Earliest placental mammals. Rapid evolution seen in mammals includes large Tertiary grazing mammals and marine mammals. Earth's climate is warm and mild. present 2.0 Cenozoic Climate cools leading to a series of ice ages at the beginning of this period. Mastodons, mammoths, and large carnivores appear. Earliest humans appear 4.5 million years ago, and Homo sapiens appear 200,000 years ago. 20,000 years ago Earth's climate began to warm. Quaternary Copyright © Amy Brown Science
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