Indicators Of Sea-level Change Research Articles

Zonality of modern coastal processes and sea-level indicators

Unlike textbooks on inland geomorphology, most of those on coastal geomorphology give the impression that the formation of the coasts is influenced by processes that are azonal or ubiquitous. Based on quite wide-ranging field studies all over Europe, North Africa, the Middle East, North America, Australia and New Zealand some deductions are presented which in several ways indicate that coastal formation is subject to zonal dynamics. As indicators of the presently active processes a variety of minor forms can be used, and particularly biological ones which, being bound to certain tide levels, can be reliable indicators of sea-level changes as well. Whenever a zonal system of the presently active processes is established, deviations from its distribution patterns may be explained by means of paleogeography and paleoclimatology. Zonality is particularly well shown by the varied distribution of climate-dependent indicators of sea level which in addition allow us to quantify sea-level fluctuations and changes of the tidal range.

Sea-Level Research: A Manual for the Collection and Evaluation of Data

IGCP Projects 61 and 200. Sea-level changes in the Holecene. Sea-Level indicators: Elevation and age relationships: raised marine deposits and landforms in glaciated areas. Sea-level markers in coastal barrier sands: examples form the North Sea coast. Marine molluscs as indicators of former sea-level stands. Beachrock as sea-level indicator. Ooids as sea-level indicator. Corals and reefs as indicators of paleo-sea levels, with special reference to the Great Barrier Reef. Coralline algae as indicators of sea-level. Vermetid gastropods as sea-level indicators. The diagenetic products of marine carbonates as sea-level indicators. Marine notches. Submerged forests as sea-level indicators. Analysis of botanical macro-remains. Foraminafera as sea-level indicators. Diatoms as indicators of sea-level change. Shell middens as a source for additional information on Holocene shoreline and sea-level reconstruction: examples from the coast of Brazil. Age: Radiocarbon dating. Dendrochronological dating. Altitude: Determination of altitude. Compaction and consolidation.

Holocene sedimentation in Port Royal Bay, Bermuda

The Port Royal Bay sediments provide an excellent record of Holocene deposition in a low fluid power marine carbonate environment and are a particularly good indicator of sea-level changes. Seismic surveying and radiocarbon dating of material recovered by vibracore allow interpretation of sub-bottom stratigraphy and basin evolution with sea-level rise. The sedimentary record shows that rising sea levels alowed a marsh to develop approximately 9500 years ago over older, red soils which existed in the lower levels of the Port Royal Basin. By 8200 yrs B.P., the marsh or swamp had been replaced by a pond in the central area of the basin. Ocean water invaded the bay about 7000 yrs B.P. to produce a marine environment, which has allowed extensive development of the coral Oculina and other marine associations above the submerged swamp and pond deposits.