Petruny MS Thesis TDP Site 31 (Cretaceous to of Tanzania)

Where: Lindi, Tanzania (10.0° S, 39.6° E: paleocoordinates 29.1° S, 29.3° E)

• coordinate stated in text

When: D. concavata, M. schneegansi, H. helvetica, & W. archaeocretacea foram zone, Lindi Formation (Kilwa Group), Early/Lower Turonian to Early/Lower Turonian (93.5 - 89.3 Ma)

• formation-level stratigraphic resolution

Environment/lithology: offshore; lithified claystone and lithified, silty claystone

• The dominant lithologies from the surface to 28 m are olive brown, olive gray and greenish black claystones and silty claystones, with massive or slightly-laminated fabrics (Fig. 9). Sub-horizontal sulfate–carbonate veins are observed at several levels. The interval from 28 m to the bottom of the hole shows mm- to cm thick, interbedded, medium to dark gray siltstones, silty claystones

•and claystones, with common, finely-laminated, possibly organic rich

•intervals (Figs. 7e and 9). Two intervals with light gray, well lithified siltstones and cross-cutting sulfate–carbonate veins are visible in cores TDP31/22 and 24. Light gray, fine-grained sandstone partings are present sporadically from 28 m to the bottom. Yellowish brown, mm- to cm-sized sand nodules occur occasionally through the middle and lower intervals of the hole. Ammonite and inoceramid debris are relatively frequent in the same intervals

•(Fig. 9). Slightly inclined lamination, indicative of moderate soft sediment

•deformation, is present throughout the hole, but is less common than at TDP Site 30.

Size class: microfossils

Preservation: original calcite, replaced with calcite

Collected by Tanzania Drilling Project Expedition in 2008; reposited in the USNM

Collection methods: bulk, core, smear slide,

Primary reference: À J. Berrocoso, B. T. Huber, K. G. MacLeod, M. R. Petrizzo, J. A. Lees, I. Wendler, H. Coxall, A. K. Mweneinda, F. Falzoni, H. Birch, J. M. Singano, S. Haynes, L. Cotton, J. Wendler, P. R. Bown, S. A. Robinson, and J. Gould. 2012. Lithostratigraphy, biostratigraphy and chemostratigraphy of Upper Cretaceous and Paleogene sediments from southern Tanzania: Tanzania Drilling Project Sites 27-35. Journal of African Earth Sciences 70:36-57 [M. Uhen/L. Petruny]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 179314: authorized by Mark Uhen, entered by Loren Petruny on 11.06.2016

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Coccolithophyceae
 Eiffellithales - Eiffellithaceae
 Eiffellithales - Chiastozygaceae
 Braarudosphaerales - Polycyclolithaceae
Lithastrinus septenarius Forchheimer 1972
Foraminifera
 Buliminoidea - Buliminidae
Fissurina sp. Reuss 1850
Nodosariata
 Robertinida - Epistominidae
 Robertinida - Ceratobuliminidae
 Nodosariida - Nodosariidae
Lagena sp. Walker and Boys 1784
Astacolus sp. de Montfort 1808
Nodosaria sp. Lamarck 1812
Dentalina sp. d'Orbigny 1826
Frondicularia sp. Defrance 1824
 Vaginulinida - Vaginulinidae
Saracenaria sp. Defrance 1824
Lenticulina spp. Lamarck 1804
Psilocitharella sp. Loeblich and Tappan 1986
Foraminifera
 Globigerinina - Hedbergellidae
 Globigerinaceae - Globotruncanidae
 Globigerinaceae - Marginotruncanidae
Globothalamea
 Rotaliida - Cancrisidae
Gyroidinoides spp. Reiss 1963
 Rotaliida - Discorbidae
Eponides sp. Montfort 1808
 Rotaliida - Gavelinellidae
 Rotaliida - Quadrimorphinidae
Quadrimorphina sp. Finlay 1939
 Rotaliida - Eouvigerinidae
Foraminifera
  -
 Lituolida - Lituolidae
  -
"Marginulina sp." = Cristellaria (Marginulina)
"Marginulina sp." = Cristellaria (Marginulina) d'Orbigny 1826
  - Chilostomellidae
Allomorphina sp. Cžjžek 1849
  - Spiroplectamminidae
Spiroplectammina sp. Cushman 1927
 Ammodiscoidea - Ammodiscidae
Glomospira sp. Rzehak 1895
Ammodiscus sp. Reuss 1862
Tubothalamea
 Miliolida - Hauerinidae