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National Geologic Map Database

Geologic Unit: Todilto

Usage:

Todilto Limestone Member of Wanakah Formation of San Rafael Group (AZ*,NM*)
Todilto Formation of San Rafael Group (AZ,CO,NM)
Todilto Limestone of San Rafael Group (AZ,CO*)


Geologic age:

late Middle Jurassic (Callovian)*


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

Not designated. Named from Todilto Park, in T. 20 N., R. 20 W., McKinley Co., NM (Gregory, 1917).
Reference section: on Horse Mesa, from sec. 17, T. 38 N., R. 31 E., Apache Co., AZ, to secs. 26 and 27, T. 29 N., R. 21 W., San Juan Co., NM (Condon and Huffman, 1988).


AAPG geologic province:

Black Mesa basin*
Las Vegas-Raton basin
Palo Duro basin
Paradox basin*
Plateau sedimentary province*
San Juan basin*
Sierra Grande uplift


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 ([ ]).