Pg. 159-163. "Rhinoceros Hill" beds and diatomaceous marl of the Ogallala formation. In northeastern part of Wallace County, western Kansas, in basin of north fork of Smoky Hill River near Marshall ranch, a somewhat different type of Tertiary sediments occurs, which, according to rich vertebrate fauna collected in them, must be contemporaneous with typical "mortar beds" of Wallace County referred by writer to Ogallala. The large collection [listed] of fossil mammals was obtained from greenish-gray sand immediately underlying a bed of snow-white diatomaceous marl (4 to 11 feet thick) that lies near top of the local Tertiary section, and that must belong to about middle of Ogallala formation. These bones are pronounced by H.T. Martin to be lower Pliocene. The marl is capped by a thin ledge of white limestone, overlain by 10 feet of slightly cemented grit, containing section. The bones were collected on Rhinoceros Hill, in SE/4 NE/4 sec. 11, T. 11 S., R. 38 W., in northeastern part of Wallace County. The hill was named by H.T. Martin, "the head of the expeditions." About 3 miles north and slightly west of Rhinoceros Hill in SW/4 sec. 26, T. 10 S., R. 38 W., in Sherman County, western Kansas, another "sand quarry" in the "fine silty deposit" of the Tertiary was opened by Martin, the fauna of which, though closely related to "Rhinoceros Hill" vertebrates, includes some varieties that are considered by him to indicate a slightly greater age than latter, though still in lower Pliocene. It appears to writer that these unconsolidated "fine silty" beds of Sherman County, which are called by Martin "Edson beds" (from a small town in Sherman County), must belong somewhere low in "Rhinoceros Hill" section, probably about 50 to 80 feet below the bed from which fauna of "Rhinoceros Hill" was collected. Pierre shale must not be far below "Edson beds" of Sherman County and at a somewhat lower elevation, than the fossiliferous sand of Rhinoceros Hill.

Source: US geologic names lexicon (USGS Bull. 896, p. 1805).

Pg. 144-145. Rhinoceros Hill beds. Included in Ash Hollow formation (Ogallala group). Consist of about 10 to 15 feet of unconsolidated sand with mammalian remains and a 6- to 7-foot deposit of white diatomaceous marl (above) that contains plant remains and fresh-water fishes. Occur a few tens of feet above Edson beds. Rhinoceros Hill sands may belong in the channel of the same late Tertiary river system as the Wray beds and the Long Island beds and are probably nearly or quite contemporaneous with them. Age is considered early Pliocene.
[GNC remark (ca. 2010): Ash Hollow Member later discarded by the Kansas Geol. Survey. See Ludvigson and others, 2009, Kansas Geol. Survey Bull., no. 256, pt. 2.]

Source: US geologic names lexicon (USGS Bull. 1200, p. 3255).