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Related Experiment Video

Updated: Jul 12, 2026

Measuring the Structure, Composition, and Change of Underwater Environments with Large-area Imaging

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Published on: April 18, 2025

Holocene changes in sea level: evidence in micronesia.

F P Shepard, J R Curray, W A Newman

Science (New York, N.Y.)

|August 4, 1967

Summary

This study found no evidence of past higher sea levels on 33 Pacific islands. Recent storms can create formations previously mistaken as indicators of sea-level changes.

Area of Science:

Geology
Oceanography
Paleoclimatology

Background:

Coral reefs are sensitive indicators of sea level changes.
Previous studies suggested higher sea levels in the Pacific based on reef formations.

Purpose of the Study:

To investigate evidence of past higher sea levels on islands in the Caroline and Marshall Islands.
To reassess the interpretation of reef formations as indicators of sea-level fluctuations.

Main Methods:

Field investigation of 33 islands in the Central Pacific.
Geological analysis of reef-flat island formations and rubble conglomerates.
Carbon-14 dating of conglomerate samples.

Main Results:

No emerged reefs unequivocally formed in situ or other direct evidence of postglacial high sea stands were found.

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Rubble conglomerates on islands were dated, suggesting possible former higher sea levels (1890-4500 years ago).

Recent hurricanes were observed to create similar ridges, and WWII relics were found cemented in comparable formations.

Conclusions:

The dated conglomerates do not necessarily indicate formerly higher sea levels.
Rubble tracts can be formed by storms under present sea level conditions.
There is no compelling evidence that these formations indicate past higher sea levels.