Gervillia
Species
Gervillia? montanaensis Meek, 1873
Occurrence: Piper (middle), Rich Member of Twin Creek Limestone; unit 10 of Sundance Formation at Lower Slide Lake
Includes Gervillia sparsilirata
Reference: Imlay, 1964; Imlay, 1967
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Gervillia? montanaensis
Photograph from Imlay, 1967