. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. PLEISTOCENE FORAMINIFERA FROM CAPE TOWN CITY CENTRE 149 'small type' of Heron-Allen & Earland (1932, pi. 9 (figs 29-31)). Some subsequent listings of the 'intermediate form' have been made by Boltovskoy (1959, 1961) and Lena (1966) from the coast of Argentina. Cassidulina crassa would seem to be absent in southern African waters, both in the Pleistocene and the Holocene. The 'intermediate form' appears to be confined to deposits of the latest Eemian-earliest Weichselian, and to the cold wate
. Annals of the South African Museum = Annale van die Suid-Afrikaanse Museum. Natural history. PLEISTOCENE FORAMINIFERA FROM CAPE TOWN CITY CENTRE 149 'small type' of Heron-Allen & Earland (1932, pi. 9 (figs 29-31)). Some subsequent listings of the 'intermediate form' have been made by Boltovskoy (1959, 1961) and Lena (1966) from the coast of Argentina. Cassidulina crassa would seem to be absent in southern African waters, both in the Pleistocene and the Holocene. The 'intermediate form' appears to be confined to deposits of the latest Eemian-earliest Weichselian, and to the cold waters off the west coast. Family Discorbidae Ehrenberg, 1838 Genus Planulinoides Parr, 1941 Planulinoides biconcavus (Jones & Parker, 1862) Fig. IIA-C Discorbina bi-concava Jones & Parker, in Carpenter, 1862: 201, fig. 32G. Discorbina biconcava Parker & Jones {sic) Parker & Jones, 1865: 385, 422, pi. 19 (fig. lOa-c). Brady, 1884: 653, pi. 91 (fig. 2a-c). Planulinoides biconcavus (Jones & Parker) Parr, 1941: 305, fig. a-c. Loeblich & Tappan, 1964: C584, fig. 458 (nos 4a-c, 5-6). Lowry, 1987: 269, pi. 17 (fig. la, c, ?lb). Planulinoides biconcava (Jones & Parker) {sic) McMillan, 1974: 58, pi. 5 (fig. 5a-c). Discorbinella biconcava (Jones & Parker) Carter, 1978: 19, pi. 1 (figs 2-3). Remarks This very distinctive species, widespread in shallow marine environments around south-east Australia at the present day (Carpenter 1862; Parker & Jones 1865; Brady 1884; Chapman 1909; Parr 1941, 1945; Collins 1974), also occurs sporadically around southernmost Africa. Specimens from the middle shelf of the Agulhas Bank (McMillan 1974) are always abraded and scoured, and clean tests would seem to be lacking. Whether this indicates that Planulinoides biconcavus is restricted to latest Pleistocene (latest Eemian-earliest Weichselian), Unit III deposits on the Agulhas Bank, rather than the Holocene as well, and has been reworked into the Holocene, is not fully clea
Size: 2269px × 1102px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectnaturalhistory, booky
