Skip Links

USGS - science for a changing world

Scientific Investigations Map 2998

Geologic Map of the Abiquiu Quadrangle, Rio Arriba County, New Mexico

By Florian Maldonado


Thumbnail of and link to Pahmphlet to accompany Map PDF (40 MB)The Abiquiu 1:24,000-scale quadrangle is located along the Colorado Plateau-Rio Grande rift margin in north-central New Mexico. The map area lies within the Abiquiu embayment, an early (pre-Miocene) extensional basin of the Rio Grande rift. Rocks exposed include continental Paleozoic and Mesozoic rocks of the Colorado Plateau and Cenozoic basin-fill deposits and volcanic rocks of the Rio Grande rift. Paleozoic units include the Late Pennsylvanian to Early Permian Cutler Group, undivided. Mesozoic units are Upper Triassic Chinle Group, undivided, middle Jurassic Entrada Sandstone, and Todilto Limestone Member of the Wanakah Formation. Mesozoic rocks are folded in some areas and overlain disconformably by Cenozoic rocks. Cenozoic sedimentary rocks are composed of the Eocene El Rito Formation, Oligocene Ritito Conglomerate, Oligocene–Miocene Abiquiu Formation, and Miocene Chama-El Rito and Ojo Caliente Sandstone Members of the Tesuque Formation of the Santa Fe Group. Volcanic rocks include the Lobato Basalt, the El Alto Basalt, and dacite of the Tschicoma Formation. Quaternary deposits consist of inset ancestral axial and tributary Rio Chama deposits and Holocene floodplain alluvium, fan and pediment alluvium, and landslide colluvium.

Version 1.0

Posted August 2008

Suggested citation:

Maldonado, Florian, 2008, Geologic map of the Abiquiu quadrangle, Rio Arriba County, New Mexico: U.S. Geological Survey Scientific Investigations Map 2998, 1 sheet, scale 1:24,000, 1 pamphlet, 21 p.


General Geology

Descriptions of Map Units

Alluvium, Colluvium, Eolian, Talus, and Landslide Deposits

Axial Channel and Side-Stream Channel Deposits of the Ancestral Rio Chama

Intrusive, Extrusive, and Sedimentary Rocks

Sedimentary Rocks


References Cited

Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Accessibility FOIA Privacy Policies and Notices

Take Pride in America home page. FirstGov button U.S. Department of the Interior | U.S. Geological Survey
Questions or Assistance: Contact USGS
Last modified: Thursday, 01-Dec-2016 17:11:11 EST