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National Geologic Map Database

Geologic Unit: Lowell

Usage:

Lowell Formation of Bisbee Group (AZ-recognized locally in Bisbee area)


Subunits:

(alphabetical) --all in AZ: Cholla Member, Joserita Member, Pacheta Member, Pedregosa Member, Perilla Member, Quajote Member, Saavedra Member.


Geologic age:

Early Cretaceous


Type section, locality, area and/or origin of name:

Type locality: Ninety One Hills area [local name for hills in secs. 14 and 23, T. 24 S., R. 24 E.], immediately north of International border in vicinity of International Monument No. 91, southeast of Bisbee Junction on Southern Pacific RR [formerly El Paso and Southwestern RR], and southwest of Schlandt Ranch, [Bisbee 15-min quadrangle], Cochise Co., southeastern AZ. Named from community of Lowell [now a part of Bisbee] (Stoyanow, 1949).


AAPG geologic province:

Pedregosa basin


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).