*Supplementary reports on microfossils may follow.
Summary
This report covers the main shipment of fossil collections from the Survey Pass quadrangle, consisting of 7 boxes and 18 collections. Although only a few contain diagnostic fossils, my impression is that all represent the late Late Devonian (Famennian) and differences among them can be explained by facies variations in the near shore region, all deposited above wave base. The collections fall roughly into 5 categories:
1. Plant fragments only. Interpreted as non-marine, probably fluvial plain deposits. (77ANs 249C; and 77ANs 130B from shipment A-77-20).
2. Lingula and plant fragments. Very near shore marine, subtidal, perhaps lagoonal. (77ANs 250B).
3. Echinoderm debris only. Shallow marine, tidal to subtidal, representing thin clastic accumulations of biogenic fragments. (77ANs 225A, 247B, 77ADB 219B; also, 77ANs 205A from shipment A-77-17).
4. Echinoderm debris and molluscs. Shallow marine, subtidal, dominated by transported bivalve fragments with a few gastropod steinkerns and impressions of orthocone cephalopods (77ANs 226B, 227B, 233B, 234B, 245B, 77ADG 321B; also 77ANs 068A, 071B from A-77-13).
5. Brachiopods (including Cyrtospirifer) mollusks, echinoderm debris. Fully marine, shallow sublittoral, transported material includes some whole shells. (77ANs 222A, 228B, 249B; 77ADB 221C; 77ADG 288B, 315B; also 77ANs 013A, 065A, 071B from A-77-13).