'Ordovician period' presentation slideshows

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Geologic Time

Geologic Time. What is Geologic Time?. A relative scale which divides geologic time into units. Relative time is compared to something. Units are from largest to smallest Eon Era Period Epoch Age. Basis for subdivision. Law of superposition

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University of Liberia

University of Liberia. GEOL. 303: PALEONTOLOGY AND STRATIGRAPHY PRESENTATION THE EVOLUTION OF THE BIOSHERE WITH RESPECT TO THE ORDOVICIAN PERIOD. AUTHOR: Sam O.Grose CO- AUTHOR: Janneh V. Dukuly. INTRODUCTION.

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Fossils & The Geologic Time Scale

Fossils & The Geologic Time Scale. Fossils. Preserved remains or traces of an organism that lived in the past. Fossils are formed when organisms die and are buried in sediment. Eventually the sediment builds up and hardens to become sedimentary rock. Kinds of fossils.

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Epochs

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Fossils & The Geologic Time Scale

Fossils & The Geologic Time Scale. Fossils. Preserved remains or traces of an organism that lived in the past. Fossils are formed when organisms die and are buried in sediment. Eventually the sediment builds up and hardens to become sedimentary rock. Kinds of fossils.

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Prehistoric Sharks

Prehistoric Sharks. By Kelsey Hayes . How do we define sharks ?. sharks are a suborder of fish whose skeletons are made out of cartilage rather than bone distinguished by their streamlined , hydrodynamic shapes , sharp teeth , and sandpaper-like skin .

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Sea Urchins have radially symmetrical bodies divided into 5 equal parts

Sea Urchins. Sea Urchins have radially symmetrical bodies divided into 5 equal parts They move about using articulating spines and tube feet Jawed tube feet called pedicellariae are employed for defense along with sometimes venomous spines. Sea Urchins.

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Geologic Timeline based on Fossils

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