p. 26 ("Kirk states that exept for the Leperditia, 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. 27 ("Collections 2683, 2684, 2685, and 2686 were taken from a section of rocks about 110 feet thick in the thinner bedded facies of the Holitna group. Stromatopora sp. is very abundant in this section, and the gray limestone of which the fossil is formed stands out sharply against a buff-weathered dolomitic matrix.")
p. 27 ("It is inferred from Kirk's determination of the age of the fauna that the zone of collection 2687 is be correlated with the middle or upper Silurian stromatoporoid zone of collections 2383, 2684, 2685, and 2686.")