Using the Present to Imagine the Past-Dogs and Dinosaurs Activity 6.8 Name Date:

Question

Using the Present to Imagine the Past-Dogs and Dinosaurs Activity 6.8 Name Date: L. Modern tdog tracks is mud with mudcracks on a tidal flat, St Catherines island, Georgia Y. Triassic rock (about 215 m.y. old) from southeast Pennsylvania with the track of a three-toed Coelophysis dinosaur Figure Ab 8.1 pfrm are the modern environment (Photograph %) and Triassic rock (Photograph Y) the same? , Z. Hon ate the medern enwiromment (Phonograph X) and Triassic rock (Photograph Yi diferenti 3. Deurite the ewitonment in which Canlephysie lived ahena 215 million years ago in what is now Pennsylvania. REFLECT & DISCUSS ' se what you learned about sediment and hoe the dineosaur forstprint in Photgraph Y was preserved 183

Explanation / Answer

1. Both modern & triassic rock environment are same as both the features are Mud Cracks.

2.The first type propagate perpendicular to the clay surface causing the soil to fracture into polygonal sections. These shrinkage cracks and the process behind the associated polygonal pattern formation. The second type of fracture that occurs in concert with the formation of shrinkage cracks is the formation of “mud curls” or mud peeling. In this case a “peeling” crack propagates parallel to the surface of the clay.

3. Coelophysis lived during the late Triassic period, roughly 210 million years ago; it was one of the earliest-known dinosaurs. Coelophysis lived in what was then a seasonally dry, desert-like environment, a savanna-type climate perhaps like modern-day Kenya without the grasses (since flowering plants hadn't evolved yet).

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