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Behind this mini-mall, a cliff of the red Spearfish shale (TRPs) is topped by several feet of gravel (Tg) from a old stream channel. Rapid Creek cut down further into its bed, leaving behind a higher-level flat platform (terrace) capped by the older deposits.
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Image extracted from: ESPEJO-SERNA, A., LÓPEZ-FERRARI, A. R., MARTÍNEZ-CORREA, N., & TILL, W. (2013). A note on the typification of Hechtia galeottii (Hechtioideae, Bromeliaceae). Phytotaxa, 94(2), 41. doi:10.11646/phytotaxa.94.2.2 licensed under the Creative Commons Attribution Licence (CC-BY) creativecommons.org/licenses/by/3.0