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Species Truncorotalia crassaformis Galloway & Wissler 1927


Discussion / Comments:
Chaisson & Pearson (1997):
This species exhibits a broad range of morphologic variability, but no useful stratigraphic integrity was observed for any of the various morphotypes. Several varieties may occur in one sample, as in the middle Pliocene. Sample 154-925B-10H-5, 65-67 cm. One form is sub-quadrate, high-spired, and has only an imperforate band. A second form is ovate in peripheral outline and lower spired. A third form is more delicate than the previous two and fully keeled.
Systematics:

1
 Superregnum Eukaryota
  Regnum Protoctista
   Phylum Ciliophora
    Subphylum Postciliodesmatophora
     Ordo Globigerinida
      Superfamilia Globorotaliaceae
       Superfamilia Nonionacea
        Familia Globorotaliidae
         Genus Truncorotalia
          Species Truncorotalia crassaformis
Synonym list:
Chaisson & d'Hondt (2000):
1927 Globigerina crassaformis Galloway & Wissler. - Galloway & Wissler : p.41 pl 7 fig 12
1983 Globorotalia (Truncorotalia) crassaformis Galloway & Wissler. - Kennett & Srinivasan : p.146 pl 34 figs 6-8
1985 Globorotalia crassaformis crassaformis Galloway & Wissler. - Bolli & Saunders : p.230 36.6-7
1997 Truncorotalia crassaformis Galloway & Wissler. - Chaisson & Pearson : p.16 pl 2 figs 6-11
Chaisson & Pearson (1997):
1927 Globigerina crassaformis Galloway & Wissler. - Galloway & Wissler : p.41 pl. 7; fig. 12
1983 Globorotalia (Truncorotalia) crassaformis Galloway & Wissler. - Kennett & Srinivasan : p.146 pl. 34; fig. 6-8
1985 Globorotalia crassaformis crassaformis Galloway & Wissler. - Bolli & Saunders : p.230 36.6-7
1997 Truncorotalia crassaformis Galloway & Wissler. - Chaisson & Pearson : p.31 pl. 2; fig. 6-11
Stratigraphy - absolute ages:
FAD: 4.31 ± 0 [Ma], Chaisson & Pearson (1997) ODP Leg 154 Site 925
References:

Galloway,J.J. and Wissler,S.G. (1927):
Pleistocene foraminifers from the Lomita Quarry, Palos Verdes Hills, California . Journal of Paleontology Vol. 1

Kennett,J. and Srinivasan,M.S. (1983):
Neogene Planktonic Foraminifera - A Phylogenetic Atlas.

Bolli,H.M. and Saunders,J.B. (1985):
Oligocene to Holocene low latitude planktic foraminifers.
In: Plankton Stratigraphy Eds: Bolli, H.M.Saunders, J.B. p. 155-262

Chaisson,W.P. and Pearson,P.N. (1997):
Planktonic foraminifer biostratigraphy at Site 925: middle Miocene–Pleistocene.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 154 Eds: Shackleton, N.J.Curry, W.B.Richter, C.Bralower, T.J.

Chaisson,W.P. and d'Hondt,S.L. (2000):
Neogene planktonic foraminifer biostratigraphy at Site 999, Western Caribbean Sea.
In: Proceedings of the Ocean Drilling Program, Scientific Results Vol. 165 Eds: Leckie, R.M.Sigurdsson, H.Acton, G.D.Draper, G. p. 19-56
Anonymous: Unedited TaxonConcept data
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