The “Bald Mountain limestone” of Ruedemann has been found to consist of the upper part of the autochthonous carbonate-rock sequence of the Champlain-Hudson valleys and not to be part of the Taconic sequence. At Bald Mountain this carbonate-rock sequence is overlain unconformably by the Snake Hill shale, with local basal limestone-pebble conglomerate (Rysedorph Hill conglomerate of Ruedemann). The Taconic thrust is present; along it the fossiliferous Lower Cambrian and younger fine-grained terrigenous rocks of the allochthonous sequence have been thrust over the autochthonous Middle Ordovician graptolite-bearing black shale.

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