Bedrock mapping and stratigraphic studies by Fisher and sedimentological studies by Mazzullo have resulted in a clearer understanding of the stratigraphy and facies relationships of the Lower Ordovician Great Meadows Formation in New York (largely equivalent to the Cutting Formation in Vermont). In Washington and Warren Counties, New York, the tripartite Great Meadows consists of (1) basal cross-stratified and laminated dolomitic quartzofeldspathic siltstone; (2) middle calcitic dolostone, locally cherry; and (3) upper fine-grained limestone. Some stratigraphic nomenclatural problems are resolved, and two new names are introduced: Winchell Creek for the basal arenites and Fort Edward for the middle dolostone. The existing name, Smith Basin, is retained for the upper member. Probable disconformities occur at the base and summit of the Great Meadows. The inferred environments of the Great Meadows Formation are intermittently near-normal to hypersaline low-energy tidal flats and shallow subtidal facies.