. Annual report - Western Society of Malacologists. Mollusks; Mollusks. CHRONOZONES S o So Is N 0-* Depositional Conditions^ £ E E^ on a rising sea floor ~ fe =? = m og 08 Og 2? o 5S — CO CD o en ?^'?= c ro o "" C/3-0 ra Rising sea floor (tectonic uplift and \ sedimentation) \ 1-13: Oxygen isotope stages (proxy sea level fluctuations) 500 400 300 200 Age (ka) 100 -i200. 100 ^ -1-100 Figure 1. Diagram showing sea level curve, depositional conditions on a rising sea floor, and the late Quaternary chronozones for southern California. This diagram is based on paleontologic and amino acid
. Annual report - Western Society of Malacologists. Mollusks; Mollusks. CHRONOZONES S o So Is N 0-* Depositional Conditions^ £ E E^ on a rising sea floor ~ fe =? = m og 08 Og 2? o 5S — CO CD o en ?^'?= c ro o "" C/3-0 ra Rising sea floor (tectonic uplift and \ sedimentation) \ 1-13: Oxygen isotope stages (proxy sea level fluctuations) 500 400 300 200 Age (ka) 100 -i200. 100 ^ -1-100 Figure 1. Diagram showing sea level curve, depositional conditions on a rising sea floor, and the late Quaternary chronozones for southern California. This diagram is based on paleontologic and amino acid data from fossil marine molluscan assemblages. The heavy dashed line represents a hypothetical sea floor that rises by tectonic uplift and sedimentation. In most slowly uplifting areas older littoral sediments are found at progressively higher elevations. Deposition during the minor sea level highstands of isotope stage 3 and younger deposits are still submerged below present sea level. In areas of subsidence (, western Los Angeles basin) successively older stratigraphic units are buried progressively deeper below the surface. The proxy sea level curve is based on oxygen-isotope data from foraminifers in deep sea cores (Shackelton and Updyke, 1973). The sea level curve includes oxygen-isotope stages that correlate with sea level highstands (odd numbers) and lowstands (even numbers). Western Society of Malacologists Annual Report, Vol. 32, p. 31. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Western Society of Malacologists. Pomona, Calif. , Western Society of Malacologists
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