p. 26 ("Kirk states"..."all of the genera in the collections, 2681, 2683, 2684, 2685, 2686, and 2687 range generally from the Silurian into the Devonian, but emphasizes the fact that the species represented indicate Silurian rather than Devonian age. He points out that the Favosites in collection 2687 is of Silurian type and states that he believes it would be safe to assign these collections to middle or late Silurian age."
p. 26-67 ("Collection 2681 consists of a fossil fragment collected from a more massive facies of the Holitna group. Its stratigraphic position is somewhat uncertain").