Back Rio Grande Formation
9 distinct taxa, from 17 fossil occurrences the Paleobiology Database records under this name, spanning 84–72 Mya.
Portland · JM
9 taxa · 17 fossils · 84–72 MyaMembers recorded: Lower limestone, Upper limestone.
Macrostrat dates this rock 76–74 Ma. Macrostrat’s own record
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1 distinct localities, where the rock is now rather than where it was laid down. Tectonics draws the world it belonged to.
When
What has been found
What else lived thenRank the rock of a period
Counts are of occurrence records, which measure the rock and the fieldwork together.