Many people think of fossils as only dinosaur bones but there are many more!!! Bones Teeth Hard shells Impressions of plants or animals Footprints Hair Can you think of any other types of fossils?
Variety of fossils! Tyrannasaurus teeth Burrow Alethopteris fern impression Human footprint from 20,000 years ago
Coprolite is a poop fossil! Check out the size of that coprolite…WOW!!
Evidence in the fossil record Transitional fossils –A transitional fossil is any fossil which gives us information about a transition from one species to another Vestigial structures –A structure that is no longer used or have greatly decreased in importance.
Transitional fossil in the fossil record snake (Haasiophis terrasanctus) -- a snake with legs.
Snakes with Legs…Why?? Vestigial legs are a clue that snakes descended from lizards. Over 100 million years ago, some lizards happened to be born with smaller legs, which, in certain environments, helped them move about unencumbered.
Transitional fossil in the fossil record Whale: Ambulocetus natans means swimming whale who walks.
Whales don’t walk they swim? The vestigial pelvis and femur bone found in modern day whales is evidence that the whale’s ancestors were land mammals.
How does the diversity in the fossil record help scientist? The geological time scale
Geological Time Scale To tell the age of most layered rocks, scientists study the fossils the rocks were found in. Fossils give evidence that helps determine what happened in history and when it happened.
Feathered dinosaurs ~167 million years ago ~120-110 million years ago
Evidence from the fossil record: Extinct Organisms Giant Sloths Extinct ~1550 AD Trilobites Extinct ~250 million years ago
Oldest microfossil found ~3.6 billion years old William Schopf (UCLA) Microfossil of cyanobacteria- like organism Found from the Apex Chert in the Warrwoona group which are mountains in western Australia
First Mulitcellular Fossil: Eukaryotes First known fossils ~1.5 Bya Diversified rapidly First multicellular fossils ~ 640 Mya Most of these were soft-bodied
Ediacaran fossils 610-542 million years ago First morphologically complex (shape, structure, color, pattern ect…) multicellular organisms
Life during the Cambrian epoch (from the Burgess Shale ~540 mya)