Publications
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Topographic control and accumulation rate of some Holocene coral reefs: south Florida and Dry Tortugas Topographic control and accumulation rate of some Holocene coral reefs: south Florida and Dry Tortugas
Core drilling and examination of underwater excavation on 6 reef sites in south Florida and Dry Tortugas revealed that underlying topography is the major factor controlling reef morphology. Carbon-14 dating on coral recovered from cores enables calculation of accumulation rates. Accumulation rates were found to range from 0.38 m/1000 years in thin Holocene reefs to as much as 4.85 m/1000...
Authors
E.A. Shinn, J.H. Hudson, R. B. Halley, B. H. Lidz
Limestone compaction: an enigma Limestone compaction: an enigma
Compression of an undisturbed carbonate sediment core under a pressure of 556 kg/cm2 produced a “rock” with sedimentary structures similar to typical ancient fine-grained limestones. Surprisingly, shells, foraminifera, and other fossils were not noticeably crushed, which indicates that absence of crushed fossils in ancient limestones can no longer be considered evidence that limestones...
Authors
Eugene A. Shinn, Robert B. Halley, J. Harold Hudson, Barbara H. Lidz
Topography, structure, and mare ridges in southern Mare Imbrium and northern Oceanus Procellarum Topography, structure, and mare ridges in southern Mare Imbrium and northern Oceanus Procellarum
The gross topography in southern Mare Imbrium and northern Oceanus Procellarum correlates with the buried structure and deposits of the Imbrium Basin and its rim, and many of the mare slopes may be depositional and reflect the pre-existing major features of the basin. Post-depositional, local distortion of the mare surface, however, is present and in many places associated with mare...
Authors
Baerbel K. Lucchitta
Crater clusters and light mantle at the Apollo 17 site: A result of secondary impact from Tycho Crater clusters and light mantle at the Apollo 17 site: A result of secondary impact from Tycho
The morphologies of Tycho secondary craters and their ejecta deposits were studied using full-Moon, Lunar-Orbiter, and Apollo panoramic photographs. These data were compared with similar data for the secondary craters and light mantle of the Apollo 17 landing site. The results indicate that (1) the central crater cluster and the light mantle can be attributed to Tycho, (2) the dominant...
Authors
Baerbel K. Lucchitta
The landslide hazard in the San Francisco Bay region The landslide hazard in the San Francisco Bay region
Development in hilly or mountainous terrain has resulted in much landslide damage. Areas susceptible to landsliding can be recognized. Practices for minimizing landslides are presented.
Authors
E. E. Brabb
Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska: July 1977 Preliminary geomagnetic data, College Observatory, Fairbanks, Alaska: July 1977
The preliminary geomagnetic data included here is made available to scientific personnel and organizations, as part of a cooperative effort and on a data exchange basis because of the early need by some users. To avoid delay, all of the data is copied from original forms processed at the observatory; therefore it should be regarded as preliminary.
Authors
J.B. Townshend, J.E. Papp, M.J. Moorman, C.E. Deadmon, S.P. Tilton