Oncolites assigned to the form genus gouldina have microstructures referrable to Girvanella grandis. Their form and geologic occurrence reflect conditions marginal to a transgressing sea (probably intertidal). Stratigraphy, petrography, and paleontology of Komia and Donezella limestones suggest that Donezella grew on the landward flank of a Komia bank. The environment of Codiaceae? is uncertain; the varied fauna with which it is found suggests normal marine conditions.

The oncolites, Donezella limestone, and Komia limestone are early Derry (Donezella also occurs in Morrow rocks); the Codiaceae? limestone is late Derry.

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