Terraces and Paleo Sea Level Estimates at Marine Isotope Stage 3 in the Lower Isumi River Basin, Boso Peninsula, Central Japan.

Revisiting marine isotope stage 3 and 5a (MIS3–5a) sea levels within the northwestern Gulf of Mexico

“…Based on the elevation of the erosional truncation of seismic reflections, Suter et al (1987) provide inference for MIS3 sea levels in Louisiana as high as −20 m. Based on the analysis of the paleo-ecology of foraminifera within multiple cores within the northeastern Gulf of Mexico, Fillon et al (2004) argue for sea levels around −35 m during MIS3. Records from other locations around the world including South Australia (Cann et al, 1988(Cann et al, , 2000Murray-Wallace et al, 1993), Italy (Mauz and Hassler, 2000), and Japan (Kuwabara et al, 1999) suggest that the Gulf of Mexico was not the only margin that may have experienced elevated MIS3 sea levels. Records from the South Australian shelf place MIS3 sea levels between −22 and −29 m bsl based on amino acid racemization of mollusks within a shallowmarine carbonate succession (Cann et al, 1988;Cann et al, 2000;Murray-Wallace et al, 1993).…”

“…Records from the South Australian shelf place MIS3 sea levels between −22 and −29 m bsl based on amino acid racemization of mollusks within a shallowmarine carbonate succession (Cann et al, 1988;Cann et al, 2000;Murray-Wallace et al, 1993). Records from estuarine deposits within uplifted terraces and bound by tephra deposits of known ages along the Boso Peninsula of Japan suggest Stage 3 sea-level elevations of −22 to −34 m bsl (Kuwabara et al, 1999). On the Crotone Peninsula of southern Italy, optically stimulated luminescence (OSL) ages of shallow-marine sediments within tectonically uplifted terraces constrain sea levels to around −15 ± 10 m (Mauz and Hassler, 2000).…”

Incised-valley-fill succession affected by rapid tectonic uplifts: An example from the uppermost Pleistocene to Holocene of the Isumi River lowland, central Boso Peninsula, Japan

“…In the studied part of the lowland, several marine depositional terraces have been distinguished (Nagasawa, 1979;Sekimoto and Endo, 1989;Shishikura, 1994). Volcanic ash beds near the top of the terrace sediments clearly show that some of them were deposited during Marine Isotope Stage 3 (Kuwabara et al, 1999). Most of them were formed after 7.0 ky BP (Nagasawa, 1979;Sekimoto and Endo, 1989).…”