Kevin Hobbs

• New Mexico Institute of Mining and Technology

This hazard map displays the distribution of the level of risk associated with the potential for having an erosion (loss of sediment) or deposition (accumulation of sediment or “sedimentation”) event in the Cañon Largo watershed on the southern Jicarilla Apache Nation. The risk values displayed on this map range from 0 (low risk) to 1 (high risk fo...

Every fall since 1950, the New Mexico Geological Society (NMGS) has held an annual Fall Field Conference that explores some region of New Mexico (or surrounding states). Always well attended, these conferences provide a guidebook to participants. Besides detailed road logs, the guidebooks contain many well written, edited, and peer-reviewed geoscie...

Paleosols can represent intervals of nondeposition in sedimentary packages and are used with increasing frequency as proxies for paleoenvironmental conditions during basin filling. However, the complexities of factors both internal and external to pedogenesis require consideration of paleosols in any basin or sedimentary package in a broader contex...

Fluvial siliciclastic rocks bracketing the Cretaceous-Paleogene (K-Pg) boundary in the San Juan Basin, New Mexico (USA), provide records of regional fluvial and tectonic evolution during the Laramide orogeny. Petrographic analyses of sandstones from the Upper Cretaceous Fruitland Formation and Kirtland Formation and the Paleocene Ojo Alamo Sandston...

The uppermost sandstones of the Asencio Formation of southwestern Uruguay are characterized by a striking iron-rich geochemical overprint, which has been interpreted as paleopedogenic in origin. Among the notable features of the Asencio is the extension of the overprint into tubes that extend several meters into the underlying Mercedes Formation. F...

Paleosols preserved between flows of the Columbia River Basalt Province record hiatuses in basalt emplacement and provide detailed information about paleoclimatic and pedogenic conditions during pedogenesis. The relatively long duration of pedogenesis (10⁴ to >10⁶ yr) for these paleosols makes them unlikely to have been influenced by short-duration...

The top of the Asencio Formation of western Uruguay is a 4+ meter thick interval of iron-stained sandstone that lies immediately above, and sometimes overprints the Late Cretaceous, dinosaur-bearing sandstones of the Mercedes Formation. The exact stratigraphic relationship of these units has been the subject of much debate, with some authors classi...

Periods of widespread soil development in active sedimentary basins represent times when neither aggradation nor degradation occur, yet not every inferred period of depositional/erosional inactivity is marked by a paleosol in the rock record. To address some of the factors affecting soil development and preservation in a syntectonic succession of f...