Temporal range
Triassic
Jurassic
Cretaceous
Paleogene
Neogene
252
201
145
66
0 Ma
Geological group / Member
Trinity / Upper
49
Trinity
26
Trinity / Lower
16
Trinity / Middle
2
Trinity / Thorp Springs
1
Depositional environments
Marginal marine indet.
12
Shallow subtidal indet.
10
Collection activity by decade