Dinosaur Evolution. How do we know when dinosaurs lived? Layers of sedimentary rock & absolute dating –Late Triassic (during Mesozoic) through end of.

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Presentation transcript:

Dinosaur Evolution

How do we know when dinosaurs lived? Layers of sedimentary rock & absolute dating –Late Triassic (during Mesozoic) through end of the Cretaceous –Also see birds & flowers for the first time during the Mesozoic (you know this!)

Dinosaurs? “Terrible Lizards” (1841) –Sir Richard Owen Not all reptiles are dinosaurs! Dinosaurs did not fly or swim! –Pterodactyls were flying lizards (or at least winged lizards)

Ornithischia bird hipped (posterior pubis along ischium)

Ceratopsia (Triceratops), Thyreophora (Stegosaurus), Ornithopoda (Iguanodon, Hadrosaurs) –Some may have been bipedal

Saurischia Lizard pelvis –Pubis anterior & downward

Up to 75,000 kg (over 165,000 lbs!) *Brachiosaurus probably had a blood pressure that exceeded 630mmHg (yours is probably around 120mmHg)

Sauropoda- herbivores( Diplodocus ) Therapoda (bipedal meat eaters) T. rex, Maniraptora (Velociraptor), Dilophasaurus

Good bye… Cretaceous-Tertiary Extinction (K/T Extinction) –Active plate movement, mountain- building, volcanism –Lowering of global sea level –Gentle global cooling –Asteroid impact

K/T Extinction Chicxulub (devil’s tail) crater- Gulf of Mexico –Block sunlight –Short-term global warming –Global wildfires –Acid rain –Long term global cooling