Larsen and Lipman note that there are "evergreen, shrub, and rare deciduous tree and insect fossils found here along the laminae surfaces" of the tuffaceous siltstones. Stop 2.5 in Larsen and Lipman.
References
Page 34 - Larsen, D. and Lipman, P., 2016 Exploring the ancient volcanic and lacustrine environments of the Oliocene Creed caldera and environs, San Juan Mountains, Colorado, Geo. Soc. Am. Field Guide 44, p. 1 - 40
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