Abstract

An assemblage of graptolites characteristic of the early Ludlow zone [Silurian] of Monograptus nilssoni is recorded from the vicinity of Ashland, Aroostook County, Maine. The zone of M. nilssoni may be correlated with the latter part of the Niagaran. Most of the forms in the assemblage are monograptides of the dubius-vulgaris-tumescens groups. One new species, M. forbesi, and 2 new varieties, M. tumescens var. contus and M. vulgaris var. ashlandensis, are described.

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