[Herbert C. Kraft et al. (1994)] There is less fragmentation of shells in giant oyster deposits (index is the weight of 1/2-in screen shell divided by 1/4-in screen shell). Their more frequent invasion by sponges making large bore holes gives credence to Brennan's idea that the giant oysters had been collected from water of higher salinity than the later oysters lived in. The giant oyster levels were also marked by higher quantities of barnacles, much Biological Information The shell deposits vary in thickness from over48 in (122 cm) in the southern tip of the point to shell free in the middle to 66 cm (26 in) in the northern area. In the most recent excavation program, sediments from 212 column levels, each 5 cm thick, were passed through stacked 1/2-in, 1/4-in, and 1/16-in mesh screens. The contents of the two larger screens were sorted and various analyses performed on the constituents. Occasionally, the 116-in material was also sorted into component parts. It was always sorted through for flakes, bones, and some types of invertebrates (crabs, odostomes, slugs, Mya arenaria, Dwarf Surf Clam). Artifacts Artifacts made on biological materials were surprisingly rare at Dogan Point. Bone and antler pieces were entered as artifacts in the Brennan catalogue but were not relocated. Bone artifacts from the recent excavation were two: a scratched tapering bone piece and a ground turtle scute. Three antler tines were recovered, but none had obvious usewear or modification.