Link to USGS Home Page

Online guide to the continental Cretaceous-Tertiary boundary in the Raton basin, Colorado and New Mexico

Figure 1. Index map showing location of Raton basin and representative K-T boundary sites
Figure 1. Index map showing location of Raton basin and representative Cretaceous-Tertiary boundary sites in New Mexico and Colorado. Columnar sections at or near top of lower zone of Raton Formation show lithology of the boundary interval at selected sites: YCC, York Canyon; RAT, Raton; SUG, Sugarite; SVS, Starkville South; BER Berwind Canyon; and MAD, Madrid. Arrows indicate the K-T boundary. Measured Ir anomalies shown in ng/g (10-9 g/g). Hachured line shows top of Trinidad Sandstone. (Modified from Pillmore and Flores, 1987).

USAGov: Government Made Easy U.S. Department of the Interior, U.S. Geological Survey
This page is http://esp.cr.usgs.gov/info/kt/fig1.html
Maintained by ESP Web Team
Last modified Tue 23-Mar-2004 14:04:46 MST
Policies and Disclaimers