Biostratigraphic zonation, Imperial Adgo F-28 well, 69°27'22" lat., 135°51'10" long., Northwest Territories

The biostratigraphy on Imperial Adgo F-28 consists of palynostratigraphy and zonation by Dr. Geoffrey Norris and a micropaleontological analysis by Dr. W. Braun. One hundred and six micropaleontological slides and 77 micropaleontological preparations from well cuttings provided by the Geological Survey of Canada were examined in detail. Samples were meagre in quantity from 50-5,000 feet and absent in the intervals 1200-1250 and 9300-9400 feet. No conventional cores were taken on the well. A continuous zonation based on microflora was established from 10,528 feet (total depth) to near surface. Eight recognizable zones extend from Middle Eocene-Older Paleogene to Neogene. The micropaleontological investigation provides three assemblages . Assemblage I and Assemblage II (surface to 2800 feet) are mainly Neogene and possibly Oligocene in age. The Haplophragmoides 67 assemblage from 8200 to 9200 feet contained in a restricted marine section, is dated Paleogene. The remainder of the well was barren of diagnostic microfossils due to the presence of a dominantly continental terrestrial deltaic sequence.