Blackites incompertus
Set number: 1112
-
1
-
2
-
3
-
4
-
5
-
6
-
7
-
8
10µm
Blackites incompertus Roth, 1970
Species of Blackites Blackites Hay & Towe (1962) with a narrow base. The long and narrow distal process tapers to a point [always slightly broaden at the middle but never as broad as the base]. The inner cycles of the base are birefringent in the side view. The surface of the distal process is smooth.
This species was erroneously assigned to Blackites tenuis (Bramlette & Sullivan, 1961) Sherwood (1974) in the publications.
Blackites incompertus is identified from Blackites tenuis by having a distal process slightly broaden in the middle, whereas the latter has a distal process that gradually tapers to a point.
Bramlette, M. N. & Sullivan, F. R., (1961): Coccolithophorids and related nannoplankton of the Early Tertiary in California. - Micropaleontology. 7(2): 129-188.
Roth, P. H., (1970): Oligocene calcareous nannoplankton biostratigraphy. - Eclogae Geologicae Helvetiae. 63: 799-881.
Sherwood, R. W., (1974): Calcareous nannofossil systematics, palaeoecology and biostratigraphy of the Middle Eocene Weches Formation of Texas. - Tulane Studies in Geology. 11: 1-79
Holotype
Blackites incompertus
Roth, 1970
Oligocene
The Lone Star Cement Company Quarry, St. Stephens, Alabama, U.S.A