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Eons

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223 Terms

1

Eons

Hadean, Archean, Proterozoic, Phanerozoic

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Eras of the Phanerozoic Eon

Paleozoic, Mesozoic, Cenozoic

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3

Cenozoic Periods

Paleogene, Neogene, Quaternary

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4

Mesozoic Periods

Triassic, Jurassic, Cretaceous

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5

Paleozoic Periods

Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian

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6

Biggest to smallest time scale

eon, era, period, epoch

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7

What conditions limited diversity in ediacaran?

low atmospheric O2 and 2 glaciation

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8

atmospheric O2 rising after glaciation during warming

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predation forcing natural selection

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10

Character of late precambrian ecological niches

-no continental biota (intense weathering)

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-rodinia supercontinent

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-shallow marine dominated by stromatolite mats

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fossils were benthic or platonic (no burrowing)

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-vertebrate fishes appear

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planktonic

Describes bacteria that are freely floating in water.

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benthic

bottom of an aquatic ecosystem; consists of sand and sediment and supports its own community of organisms

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Cambrian period: overcoming the challenges to multi-cellular life

size limiting factor (low O2)

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snowball earth

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after last snowball earth

late Proterozoic

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stabilization of climate (clement conditions)

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end of Paleozoic orogenies

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break up of rodinia

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large igneous provinces

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What caused Caused the Cambrian explosion

drastic reorganizing of substrate ecology

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rise of predation

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rising O2 levels

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Ediacaran fossils

mostly benthic or planktonic

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no indication of substrate burrowing

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Ediacaran marine environments

shallow environments were covered in algal mats

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this hindered development of varied ecological niches and suppressed diversification

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decomposing alge

decomposing algal mats may have created sporadic anoxic conditions on ocean floor

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burrowing worms

Trichophycus pedum

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biologic marker for beginning of Cambrian

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Kingdom Protista (since Archean)

eukaruota

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single celled with exoskeleton for protection

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foraminifera

marine protist

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CaCO3 exoskeleton

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1-2 inches

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diverse

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present since Cambrian

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radiolaria and diatoms

mid cretaceous

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protist

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exoskeleton made of silica

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Life forms appearance in Cambrian explosion

Invetebrates

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vertebrates

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types of invertebrates in order

Bryozoa

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brachiopods

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arthropods

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echinoderms

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hemichordates

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types of arthropods

crustaceans

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mollusks

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insects

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arachnids

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vertebrates

type of horde

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one of the earliest progenitors

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Phylum Porifera

sponges

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vessel shaped

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full body pores to Chanel water and circulated

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produce hard mineral called spicules

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diverse

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since Cambrian

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filter feederes

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sessile

reef building sponges

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Phylum Cnidara

soft bodies metazoans, sac like

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filter feeders

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jelly fish

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coral

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corals

group of cnidaria

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consist of plolyp that builds mineralized theca

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fossilize easily

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Phylum Brachiopoda

"strong short arm"

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new in Cambrian

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shallow marine invertebrates

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clams

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vertical symmetry

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filter feeds

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reef builders

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benthic or burrowers

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Phylum Mollusca

soft bodies

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marine, freshwater, or terrestrial

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swim flat or drift

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burrow bore or crawl

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three classes

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classes of Mollusca

bivalves (clams)

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gastropods (snail)

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cephalopod (squid)

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Phylum arthropoda

one of largest phylum

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shellfish and molluska

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crustacea

shellfish and molluska

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elongated bodies and soft shells

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family include

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barnacles

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crabs

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crayfish

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lobster

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prawns

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shrimp

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land snails

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subclass ostracod

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