The palynology of Upper Pleistocene and Holocene sediments from the eastern shoreline and Central Depression of St. Catherines Island, Georgia, USA

The genus Stylatractus Haeckel, 1887 (Radiolaria, Actinommidae) is abundant in upper Pleistocene – Holocene sediments form the Rio Grande do Sul continental margin. Some species of this genus are important Cenozoic biostratigraphic tools. A detailed analysis of the species distribution in Core T18 (GEOMAR VII), as well as an estimate of the chronology of these sediments was done. A revision of Stylatractus is proposed, based on the growth patterns of the Actinommidae skeletons. Three species of Stylatratus were identified in the studied material: Stylatractus neptunus Haeckel, emend., Stylatractus pluto Haeckel n. comb. and Stylatractus nerinus n.sp. The occurrence of Stylatractus nerinus n.sp. suggests that these sediments were deposited in the upper Pleistocene. The Pleistocene-Holocene transition is established by the first occurrence of Stylatractus pluto Haeckel n. comb. The results obtained from Core T18 can be extended to other cores from the Rio Grande do Sul continental margin where the genus was reported.

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Antwerp University Radiocarbon Dates I

Radiocarbon ◽

10.1017/s0033822200003003 ◽

1976 ◽

Vol 18 (2) ◽

pp. 151-160 ◽

Cited By ~ 4

Author(s):

R Vanhoorne ◽

W Van Dongen

Keyword(s):

Financial Support ◽

Radiocarbon Dating ◽

Radiocarbon Dates ◽

Upper Pleistocene ◽

Holocene Sediments ◽

Stratigraphic Position ◽

Set Up

The radiocarbon dating laboratory was set up during 1972 and 1973 with financial support of the FKFO (Fonds voor Kollektief Fundamenteel Onderzoek) Belgium, to enable us to place Upper Pleistocene and Holocene sediments in their correct stratigraphic position. Dating of samples began in the middle of 1974.

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Stratigraphy and paleoenvironment of Upper Pleistocene to Holocene sediments in the Ishikari Plain, Hokkaido, Japan

The Journal of the Geological Society of Japan ◽

10.5575/geosoc.116.13 ◽

2010 ◽

Vol 116 (1) ◽

pp. 13-26 ◽

Cited By ~ 5

Author(s):

Tsumoru Sagayama ◽

Tokuji Tonosaki ◽

Tsutomu Kondo ◽

Satoshi Okamura ◽

Kiminori Sato

Keyword(s):

Upper Pleistocene ◽

Holocene Sediments

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Neotectonic structure of the Lakonikos gulf

Bulletin of the Geological Society of Greece ◽

10.12681/bgsg.17026 ◽

2001 ◽

Vol 34 (1) ◽

pp. 297 ◽

Cited By ~ 1

Author(s):

D. PAPANIKOLAOU ◽

C. METAXAS ◽

G. CHRONIS

Keyword(s):

Seismic Reflection ◽

Single Channel ◽

Strike Slip ◽

High Angle ◽

Upper Pleistocene ◽

Sea Bottom ◽

Holocene Sediments ◽

Transcurrent Faults ◽

Slip Motion

Detailed single-channel seismic reflection survey has been carried out in the Lakonikos Gulf, Southern Péloponnèse, aiming to a better understanding of the neotectonic structure of the Lakonikos Basin. Our survey showed that, contrary to the model of a simple N-S asymmetric graben previously considered, a tectonic horst occurs within the tectonic graben of Lakonikos. A subsidence of more than 1000m is produced by the N-S marginal faults, whereas, the N-S faults creating the central horst structure within the Lakonikos graben are high-angle reverse faults, which have uplifted the sea bottom together with the Pleistocene and Holocene sediments by about 100m. Several E-W vertical transcurrent faults, with strike-slip motion deform the N-S structures. The central tectonic horst structure is very recent as the observed deformation of the Upper Pleistocene and Holocene sediments indicated and a transtensional geodynamic regime is suggested.

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