Geological Time Scale Range Chart Million Era Period Years ago Notable events Historic time Quaternary 0.01 Extinction of many large mammals; modern humans appear 1.80 Early humans emerge (genus Homo) 5 Grasses replace forests in drier areas 23 Rise of several modern mammals Tertiary 35 Earliest whale fossils; first horses 56 First primate fossils Extinction of dinosaurs 65 Cretaceous Angiosperms replace gymnosperms in many habitats 146 First bird fossil (Archaeopteryx) First flowering plants (Angiosperms) Jurassic 200 Triassic First dinosaurs and mammals 251 Permian First mammal-like reptiles 299 First reptiles First gymnosperms Carboniferous 359 First seed-bearing plants Fish-to-tetrapod transition Devonian 416 Silurian Early jawed fishes First fossils of land animals 444 First plant fossils First fungus fossils Ordovician 488 First fossil of chordate (ancestors of vertebrates) Cambrian Explosion Cambrian 542 635 First animal fossils 1,200 First multicellular life 2,000 First eukaryotic fossils 2,400 First substantial oxygen accumulation in atmosphere 3,400 Evidence of abundant bacterial and archaeal life 3,800 Possible evidence of earliest life on Earth 4,600 Earth is formed 2011 Pearson Education, Inc. Fossil #: 2 Page 5 of 17 Precambrian Paleozoic Mesozoic Cenozoic N Batostomella gracilis

BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)

10th Edition

ISBN:9781305967359

Author:STARR

Publisher:STARR

Chapter21: Plant Evolution

Section: Chapter Questions

Problem 5CT: Suppose you wanted to make a science fiction film in which human time travelers went back to the...

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Shade the geological time range for each fossilized organism, marking the time period where each fossil belongs to in a darker color (see example for fossil #2: Batostomella gracilis ): Fossil #7: Mucrospirifer thedfordensis Fossil #16: Cardioceras species Fossil #17: Dinosaur bone Fossil #21: Otodus species Fossil #23: Dentalium sexangulare Fossil #24: Physa humerosa

Geological Time Scale
Range Chart
Million
Era Period
Years ago Notable events
Historic time
Quaternary
0.01
Extinction of many large mammals; modern humans appear
1.80
Early humans emerge (genus Homo)
5
Grasses replace forests in drier areas
23
Rise of several modern mammals
Tertiary
35
Earliest whale fossils; first horses
56
First primate fossils
Extinction of dinosaurs
65
Cretaceous
Angiosperms replace gymnosperms in many habitats
146
First bird fossil (Archaeopteryx)
First flowering plants (Angiosperms)
Jurassic
200
Triassic
First dinosaurs and mammals
251
Permian
First mammal-like reptiles
299
Carboniferous
First reptiles
First gymnosperms
359
First seed-bearing plants
Fish-to-tetrapod transition
Devonian
416
Silurian
Early jawed fishes
First fossils of land animals
444
First plant fossils
First fungus fossils
Ordovician
488
First fossil of chordate (ancestors of vertebrates)
Cambrian Explosion
Cambrian
542
635
First animal fossils
1,200
First multicellular life
2,000
First eukaryotic fossils
2,400
First substantial oxygen accumulation in atmosphere
3,400
Evidence of abundant bacterial and archaeal life
Possible evidence of earliest life on Earth
3,800
4,600
Earth is formed
2011 Pearson Education, Inc.
Fossil #: 2
Page 5 of 17
Precambrian
Paleozoic
Mesozoic
Cenozoic
N Batostomella gracilis

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