English: St. Croix geologic map, where Km is the Cretaceous Mt. Eagle Group, Kd is Cretaceous diorite, Kg is Cretaceous gabbro, Tbf is the Pliocene Blessing Formation, Tmb and Tlr are the Miocene Kingshall Limestone, Qab is Quaternary alluvium, and Qr is Quaternary reef.
Date
Source
Geology and Hydrogeology of the Caribbean Islands Aquifer System of the Commonwealth of Puerto Rico and the U.S. Virgin Islands, USGS Professional Paper 1419
Author
R.A. Renken, W.C. Ward, I.P. Gill, F. Gomez-Gomez, J. Rodriguez-Martinez