Pg. 312. Ashley Hill Cambrian limestone [in heading]. Another limestone belt associated with grits and shales occurs at Ashley Hill, in northeastern corner of Chatham Township, Columbia County, about 1 mile north of Bayville or Rider's Mills Station on Lebanon Springs RR, and 2 miles south of Brainard, in Nassau, eastern NY. This limestone belt cannot be connected with other limestone belts in this region, as they trend differently and are separated by masses of grit. Age is Cambrian.

Source: US geologic names lexicon (USGS Bull. 896, p. 81).

Pg. 694-695. Ashley Hill conglomerate mentioned under section headed Schodack shale and limestone. Rock sequence crops out on west ridge of Ashley Hill. Sequence begins with dark-gray quartzite and is succeeded by sequence of limestone, shale, and limestone conglomerate which is not known elsewhere in Kinderhook quadrangle. A crystalline limestone pebble in Ashley Hill conglomerate contains BOTSFORDIA CAELATA [Brachiopod]. On basis of lithologic, stratigraphic, and fossil evidence, conglomerate and underlying limestone and shale are correlated with Schodack shale and limestone. Underlying quartzite is probably equivalent to Diamond Rock quartzite (Ruedemann, 1930, New York Mus. Bull. 285). [Age is Cambrian.]

Source: US geologic names lexicon (USGS Bull. 1200, p. 152-153).

Pg. 10-11. Ashley Hill Limestone Conglomerate [unranked] in Nassau Formation (Bird [abs.], 1962, GSA Spec. Paper 68, p. 135). Lithically, stratigraphically, and faunally similar to North Brittain Limestone Conglomerate Member of Bull Formation of Zen (1961, p. 303). Fossils (ELLIPTOCEPHALA ASAPHOIDES fauna). Age is Early Cambrian.

Source: Publication.