Urraca Formation
Geology
Members: Hill Point (9), Mimitimbi (4), Swan Kay (1)
Lithologies: siltstone (1), packstone (1), "limestone" (13)
Paleoenvironments: perireef or subreef (4), platform/shelf-margin reef (10)
Age range: Early/Lower Pleistocene or 2.58000 to 0.77400 Ma