Measured sections in the Tomstown Dolomite, Washington County, Maryland, indicate a considerably thinner section of carbonate rocks than in Virginia. Salterella conulata Clark, found at three previously undescribed localities, is confined to a narrow stratigraphic interval and may have biostratigraphic value. S. conulata is a faunal component in the lagoon-bay portion of an Early Cambrian tidal flat complex.

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