Dinosaur Origins and History

Dinosaur Origins and History - Dinosaur Origins and history...

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Dinosaur Origins and history chapter 5 www.nhm.ac.uk/nature-online/online-ex/art-themes/20thcentury/images/iguanodon_main.jpg http://www.lindahall.org/events_exhib/exhibit/exhibits/dino/images/goo1h.jpg www.terra.es/personal3/gvbordes/dinos%20antics/cretaceo/iguanodon_z1.jpg Various depictions of Iguanodon 20th century 19 th century 21st century
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But first, a few things about science that we should know Science is not static; nothing is set in stone for all of eternity- new observations may lead to a new understanding of natural phenomena Thus, science may be thought of continually generating better approximations of the truth Science has a built-in self-correcting feedback system, unlike other branches of knowledge
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What is the feedback system? New research is always attempting to confirm or refute what we think we know If our hypotheses are not supported by facts, they are modified or rejected No one person has a monopoly on what is “right” or “wrong” in science- everyone who attempts to publish goes through a peer-review process
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Our changing view of dinosaurs How we view dinosaurs changes along with the scientific disciplines that we use to study them New research allows us to continually re- examine what we think about dinosaurs Old hypotheses are rejected if demonstrated to be unfounded
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Some examples… Dinosaurs are reptiles, and historically they have been portrayed as having a sprawled stance and dragging tails, like crocodiles www.fanas.ch/schule/dinosaurier/stegosaurus.jpg http://www.aboutaustralia.com/a2it_package/images/travel/Crocodile.jpg Early 20th century
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Problems with this interpretation Bones could not articulate in such a way to permit sprawling stance Footprint evidence shows feet were close to midline of body No belly or tail drags rarely present with footprints http://www.mcps.k12.md.us/schools/knollses/dinosaurs/DINOGR/stegosauruslg.jpg
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Sauropods were thought to have been too heavy to live on land Art by Zdenek Burian Early 20th century
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Dinosaur Origins and History - Dinosaur Origins and history...

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