Sea Level Events and Pleistocene Coral Ages in the Northern Bahamas

Quaternary Research - Tập 5 - Trang 215-224 - 1975
A.Conrad Neumann1, Willard S. Moore2
1Marine Sciences Program, University of North Carolina, Chapel Hill, North Carolina 27514 USA
2U.S. Naval Oceanographic Office, Washington, D.C. 20390, USA

Tóm tắt

Emergent Pleistocene sea level indicators in the northern Bahamas include: a bioerosional notch at +5.3 to 5.9 m; sea caves, notches, and marine terraces at about +4.3 m; and lithified coral rubble and reef deposits between 0 and 3 m. Thorium 230 dates of the fossil corals, which were deposited as these features were being produced, span the age range from 100 to 145 thousand years BP with a majority falling between 115 and 130 thousand years BP. The notch at about +5.6 m is interpreted to be the product of a sea level stand 125 thousand years BP, while the features at +4.3 m are believed to be formed sometime later as sea level fell from the higher position. Part of the age span is inherent in the dating technique and possible sample alteration. Another cause of the spread may be mixing of corals of different ages into a single deposit.

Tài liệu tham khảo

Neumann, 1968, Elevated Pleistocene Sea Level Features in the Bahamas (Abstract)., Fifth Caribbean Geological Congress 10.1126/science.166.3912.1503 10.1029/JZ068i009p02817 Vacher, 1970, Coarse and fine structure of the Bermuda eustatic curve: significance to coastal plain stratigraphy (abs.)., Geological Society of America, Abstracts, 2, 245 Kaufman, 1964, 230Th-234U dating of Carbonates from Lakes Lahontin and Bonneville., Ph.D. thesis 10.1126/science.167.3919.862 10.4319/lo.1966.11.1.0092 10.1029/JB079i002p00390 Stephenson, 1972, Life Between Tidemarks on Rocky Shores., 425 10.1029/JZ070i008p01843 10.1029/JC079i033p05065 Neumann, 1972, Elevated Pleistocene sea-level features in the Bahamas., Quaternaria, 15, 73 Vacher, 1972, Coastal dunes of Younger Bermuda., Coastal Geomorphology: Publications in Geomorphology, 355 10.1029/RG008i001p00169 10.1126/science.159.3812.297 10.1126/science.149.3679.58 10.1126/science.183.4128.959 10.1126/science.155.3769.1541 Thomson, 1971, Natural Radioactive Series Dating of Pleistocene Organic Material., Ph.D thesis, 213 10.1126/science.149.3679.55 10.1126/science.148.3676.1488 10.1126/science.166.3912.1551 10.1016/0025-3227(70)90049-6 10.1016/0033-5894(74)90007-6 10.1130/0016-7606(1967)78[993:PHOB]2.0.CO;2
Thông tin
Thông tin xuất bản

Quaternary Research

Tập 5

215-224

Thông tin tác giả