Late Pleistocene calcareous nannofossils in the caribbean and their interoceanic correlation

Calcareous nannoplankton biocoenosis : sediment trap studies in the equatorial Atlantic, central Pacific, and Panama Basin

“…This procedure proved to be rapid, effcient, and reliable (i.e., reproducible). Using the same frequency estimation technique for smear-slide examination of coccolith assemblages in the optical microscope (Gartner, 1972;Steinmetz, 1979), the observer encounters and records the most abundant taxa first. These can then be ignored, while attention is paid to the increasingly more infrequent taxa.…”

Calcareous-Nannofossil Biostratigraphy of Japan Trench Transect, Deep Sea Drilling Project Leg 57

“…Estimations of species abundances employed in this report follow the methods outlined by Hay (1970), with the slight modifications of Gartner (1972). Thus, the abundance of a species was determined with the light microscope at a magnification of 1560 × as follows:…”

Calcareous Nannofossil Biostratigraphy of the Celebes and Sulu Seas

“…This species has some special taxonomic problems because of its considerable morphologic variability in response to the changing environments of the Pleistocene. Gephyrocapsa oceanica may include specimens having a wide range of maximum diameter and bridge angle, and a broad species concept has been suggested and used in some previous works (Gartner, 1972;in press;Pelosio et al, 1980;Proto Decima and Masotti, 1981;Rio, 1982;Rio et al, in press). In this study, we follow that broad species concept, and include all Gephyrocapsa forms that are larger than 4 µm and have a distinct open center with a relatively flat bridge aligned at 30°-90° relative to the major axis into Gephyrocapsa oceanica s.l.…”

“…Relative abundances of calcareous nannofossil species were determined by a semiquantitative method modified from Gartner (1972). All slides were checked with a light microscope at a magnification of 1500X.…”