The graptolites include 13 genera and 18 species which seem to represent lower Llanvirnian age and have been assigned to the Whiterock Stage. About 1300 specimens were collected in five collections. Half the species occur as less than 2.5 percent of the total fauna of each collection. Therefore, a collection from a given locality may lack some of the rarer species. Each of the five collections was found to lack one to five species of the known fauna.

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