ERTH 2401 Lecture Notes - Lecture 13: Gastrolith, Sauropoda, Mesozoic
4 Nov 2016
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Food: ate a lot, triassic: ferns, seed plans, cycads, ginkgoes all had to be processed with these little heads and little pencil-like teeth. Found in na, sa, europe, asia and africa. Narrow tracks some are very large holes. Horseshoe shaped with no imprint of massive claw on thumb not pressed into sediment. Foot ovoid with toe claws and heel pad. Rare tail drag marks drag tail behind: feet: Forelimb: digitigrade, standing on finger tips massive, round feet. How long did it take for embryos to reach maturity? (what was the growth rate like?) How long did they live? (lifespan) difficult to identify. E. g. crocodiles make nest, leave eggs and leave them to develop on their own. Graph: growth rates ostriches grow very quickly, humans = 15 years (very. Dinosaur tracks molds and casts: foot presses into soft sediment and leaves a mold behind, as sedimentation occurs and fills the mold and we have the cast, cast vs mold, e. g.
