Petruny MS Thesis TDP Site 22 (Cretaceous of Tanzania)

Where: Lindi, Tanzania (10.1° S, 39.6° E: paleocoordinates 29.2° S, 29.2° E)

• coordinate stated in text

When: Lindi Formation (Kilwa Group), Early/Lower Turonian (93.5 - 89.3 Ma)

Environment/lithology: offshore; lithified, silty sandstone

• The dominant lithologies from 11 m to 109.80 m are mm- to cm-thick, interbedded, dark gray siltstones and fine-grained sandstones, with common, finely-laminated, organic-rich intervals (Figs. 5c, 6). The interval from 109.80 m to the bottom of the hole is composed of medium dark gray, moderately lithified, massive, medium-grained sandstones. Light gray, fine- to medium-grained sandstone partings with sharp, irregular basal surfaces are sporadically present. Moderate to intense soft-sediment deformation

•(e.g., bedding angle shifts, convoluted lamination, folded bedding) is abundant in the intervals 38.40–79.07 m and 95.70 m to the bottom of the hole (Fig. 6), and suggests relatively common processes of sediment liquidization before significant compaction took place. The intensity of stratigraphic disruption of these sediments is difficult to evaluate, since in 2007 no other holes were drilled close to TDP Site 22 that allowed examination of the lateral extension of the soft deformation. This issue, along with the driving causes of the sediment deformation, will be analyzed in future TDP expeditions. Ammonite and inoceramid debris are visible at 20.05 m and 26.90 m, respectively, and small bioclasts and bioturbation

•mottling occur sporadically.

Size class: microfossils

Preservation: original calcite, replaced with calcite

Collected by Tanzania Drilling Project Expedition in 2007; reposited in the USNM

Collection methods: core, smear slide,

Primary reference: Á J. Berrocoso, K. G. MacLeod, B. T. Huber, J. A. Lees, I. Wendler, P. R. Bown, A. K. Mweneinda, C. I. Londoño, and J. M. Singano. 2010. Lithostratigraphy, biostratigraphy and chemostratigraphy of Upper Cretaceous sediments from southern Tanzania: Tanzania drilling project sites 21-26. Journal of African Earth Sciences 57:47-69 [M. Uhen/L. Petruny]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 179875: authorized by Mark Uhen, entered by Loren Petruny on 03.07.2016

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Coccolithophyceae
 Braarudosphaerales - Polycyclolithaceae
Eprolithus moratus
Eprolithus moratus Stover 1966
Foraminifera
 Globigerinina - Hedbergellidae
Helvetoglobotruncana helvetica
 Globigerinaceae - Globotruncanidae
Dicarinella hagni, Dicarinella imbricata
 Globigerinaceae - Marginotruncanidae
Whiteinella praehelvetica, Whiteinella archaeocretacea