utdlabrador, after B. Brister & R. Gries, Tertiary Stratigraphy and Tectonic Development of the Alamosa Basin (Northern San Luis Basin), Rio Grande Rift, South Central Colorado.

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FYI, the legend on this diagram has an error. The green color (2nd-youngest division shown) is labeled "Paleocene alluvium and sediments". However, the Paleocene Epoch is older than the Eocene and Oligocene-age layers shown on the map, so this cannot be the correct name for sediments in this upper layer. This color must represent Miocene + Pliocene sediments, which collectively are grouped as the rocks of the Neogene Period.