triassic period = three layers 245 to 208 mya	jurassic period = swiss jura mts 208 to 146 mya	cretaceous period = chalk / lime beds 146 to 65 mya
Movies portray dinosaurs from all geologic eras as living contemporaneously. Make a list of dinosaurs and their "age span"; did T-rex ever see or taste Plateosaurus?
1	1	1
2	2	2
3	3	3
4	4	4
5	5	5
6	6	6
7	7	7
8	8	8
9	9	9
10	10	10

4/23t/96