Research Paper THEMED ISSUE: The Growth and Evolution of North America: Insights from the EarthScope Project GEOSPHERE Recognition and significance of Upper Devonian fluvial, estuarine, and mixed siliciclastic-carbonate nearshore marine facies in the GEOSPHERE, v. 15, no. 5 San Juan Mountains (southwestern Colorado, USA): Multiple incised https://doi.org/10.1130/GES02085.1 16 figures; 3 tables; 1 set of supplemental files valleys backfilled by lowstand and transgressive systems tracts James E. Evans1, Joshua T. Maurer1,2, and Christopher S. Holm-Denoma3 CORRESPONDENCE:
[email protected] 1Department of Geology, Bowling Green State University, Bowling Green, Ohio 43403, USA 2Carmeuse Lime and Stone Company, 6104 Grand Avenue, Suite B, Pittsburgh, Pennsylvania 15225, USA CITATION: Evans, J.E., Maurer, J.T., and Holm- 3Geology, Geophysics, and Geochemistry Science Center, U.S. Geological Survey, Denver Federal Center, Denver, Colorado 80225, USA Denoma, C.S., 2019, Recognition and significance of Upper Devonian fluvial, estuarine, and mixed siliciclastic- carbonate nearshore marine facies in the ■ ABSTRACT Allen and Posamentier, 1993; Catuneanu, 2006) and transgressive estuarine San Juan Mountains (southwestern Colorado, USA): Multiple incised valleys backfilled by lowstand and depositional systems (Cotter and Driese, 1998; Fischbein et al., 2009; Ainsworth transgressive systems tracts: Geosphere, v. 15, no. 5, The Upper Devonian Ignacio Formation (as stratigraphically revised) com- et al., 2011) in evaluating relative sea-level changes and the influence of allo- p. 1479–1507, https://doi.org/10.1130/GES02085.1. prises a transgressive, tide-dominated estuarine depositional system in the genic controlling variables (eustasy, tectonics, and sediment supply). In outcrop San Juan Mountains (Colorado, USA).