The base of the Heceta Limestone, exposed on Cap Island in southeastern Alaska, appears to lie close to the top of the celloni Zone. The succeeding 8 m of strata lies within the amorphognathoides Zone and part of the ranuliformis Zone. This Cap Island faunal sequence consists of 12 previously described and largely cosmopolitan taxa and nine new, possibly more provincial, taxa. It is particularly characterized by the distinctive new taxa Tuxekania barbarajeanae, Neospathognathodus chapini, Tokeenia furcata, and Aspelundia capensis. The section is of late Llandovery to early Wenlock (Silurian) age.

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