geo study guide #2 rd - Questions from class: 1.-why does...

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Questions from class: 1.-why does it ever rain in Tucson? Because earth is much more complicated than this simple model a: Because earth is much more complicated than this simple model 2.The Mclher ornitholesetus guarding her nest in the big all video had three finger she was a? A: Tetanuran 3.What rocks did the dinosaurs we have looked at get preserved in, and what do these rocks tell us about their environment and ecosystems?a: in the cretaceous sandstone Clade -A clade is a clade because the critters in that clade share a set of derived characteristics that are unique to them -Therefore, dinosaurs are not defined by their eggs or the holes in their skulls because other reptiles (crocs, lizards, turtles, etc.) lay the same kinds of eggs and/or have the same number of skull holes.-The # of holes in the dinosaur hole makes the clade dinosauria part of the larger clade diosida while the kind of eggs dinosaurs layed make them part of the much bigger clade amnitoa-A clade says there is something different about these animals from any other creatures that make them unique and groups them together- For dinos, the hips and ankles and some other things are distinctive. These changes gave them a bright posture Scientific Defintion of Dinosauria -Tricerotops, living birds, their most recent common ancestor and all of its decendents Saurischia 1888 - Harry Seeley (2 main devisions of dinos) *Ornithischia - “bird-hipped” * Saurischia - “lizard-hipped” Eoraptor – the dawn theif on ther line of being dino and not - own clade -Late tirassic, at ;east 220 ma ischigualasto formation of argentina-3’ long 1’@ hips maybe 20lbs -So primitive just barely a dino still had 5 finger (pinky almost gone), front teeth typically theropod back teeth like early herbovors dinos, prob omnivors eating insects small animals plants Saturnalia -first sauropodmorphis, Brazil Guaibassauru- first theropod Ischigualasto Formation- Volcanically active flood plane dominated by rivers with strongly seasonal rainfall -Ash beds used for dating -40 meter trees, ferns, horse tails - 6% of fossils tetrapods are dinos -Squrischians and ornithiscieans. -Rhynchosars and Sinodonis most common tetrapods- Rhynchosaur scaphonyx makes up over half of the tetrapod fossils Herrerasauridae-N. az and new mexico 220 ma comprised of cladde herrarasauridae clade eoraptor, clade theropoda, clade Sauropomorichia 1 Herrerasaurus -Named after Victor Herra local artist who first found bones in 1958- 13’ long 450 lbs 4’ tall at hip -Very primitive-didn’t have three vertebres fully incorporated into the pelvic region still, have vestigial pinky 2Staurikosaurus -6 -7’ 65 lbs 2.5’ tall @ hips-Prop older than eoraptor and herrerasourous -from brazils santa maria formation-only 2 pelvic vertebres-named for southern crust Beezlebufo “The Devil toad -70 ma, madagascar, 16 inches long 10lb-Horns and head shield-Relatives are the “pac-man” frog of S. America much smaller but hyper aggressive frogs - Prob and ambush preditor that ate lizards and other smaller vertebrae including dino
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geo study guide #2 rd - Questions from class: 1.-why does...

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