Preliminary geologic map of Ellipse III-11-8 and vicinity
Ellipse III-11-8 is in southeast Oceanus Procellarum, south of the craters Kepler and Encke.
Open-File Report↗
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Preliminary geologic map of Lunar Orbiter site III-P-11
Site III P-11 is in the southern portion of Oceanus Procellarum, approximately 320 km south of the crater Kepler.
Open-File Report↗
A summary of relative ages of lunar nearside and farside plains
This report contains a summary of the moon-wide distribution of relative ages of lunar plains units determined with Apollo and Lunar Orbiter photographs. Relative ages are expressed as the largest diameter of craters (D L , meters) in a mappable unit that are eroded to a slope of 1 ° by the net accumulated flux of small impacts. New data show that the technique used here generally requires a sample area less than 2,000 km 2 for satisfactory results. Additionally, the measurement of relative age (D L ) using this technique is unaffected by resolutions of about 0.15 D L or smaller. Results obtained indicate there are two types of plains: 1) light plains and 2) mare plains. The light plains units have two separate and distinct ages (D L ≃ 550 m and D ≃ 1100 m). The range in ages for each of these units is so small that each could represent two separate synchronous lunar events. The maria were deposited in three major stages after the emplacement of the light plains units. The oldest mare units ( > 3.7 b.y. old) are in Mare Tranquillitatis, Mare Vaporum, southeastern Mare Imbrium, the dark ring around Mare Serenitatis and a thin band from the crater Reinhold to Sinus Medii. Young mare volcanism ( < 2.5 b.y. old) occurred in western Mare Serenitatis, southwestern Mare Imbrium and Oceanus Procellarum. All other mare areas investigated are of intermediate age.
Open-File Report↗
Single-Channel Seismic-Reflection Profiles and Side-Scan Sonar Records Collected During June 8-14, 1977, in the Middle Atlantic Shelf Area
A cruise aboard the R/V OCEANUS (Cruise 027) was completed by the U.S. Geological Survey during June 8-14, 1977evaluate the presence, extent, and activity of potentially mobile bedforms on the Middle Atlantic Continental Shelf, eastern United States. Based on information collected by the U.S. Geological Survey during·a geophysical survey in 1975, seven sites showing possible bedforms were selected for detailed study. At each of the seven study areas, single-channel high-resolution seismic profiling and side-scan sonar techniques were used to identify and map the size, distribution, and orientation of the different types of bedforms that were present.
Open-File Report↗
Populations of the planet-crossing asteroids
The population of Apollo, Amor and Mars crossing asteroids is studied. With the 18-inch Schmidt camera of the Hale Observatories at Mt. Palomar, four new planet crossing asteroids were discovered. A formal theory relating the probability of discovery of asteroid of a given orbital class to condition of search has been developed. From the estimated populations the flux of the Apollo objects to magnitude 18 near the Earth is of the order of (0.4 ± 0.2) 10 -14 km -2 yr -1 . During 3.3 b.y. this flux produces an estimated 60 ± 20 craters of 10 km in diameter and larger per 10 6 km 2 on the Moon. This number seems to be consistent with the observed crater densities on 3. 3 b.y. old mare surfaces in the eastern Oceanus Procellarum and Mare lmbrium.
Geologica Romana↗
Geology of the Caribbean
The Venezuelan and Colombian basins are located on the Caribbean Plate whilst the Yucatan basin is on the North American Plate. The processes occurring at the boundaries between the Caribbean Plate and the adjacent North American, South American and Cocos Plates, and the resulting surface features and patterns of volcanic and earthquake activity are described. Most of the Caribbean area is floored by atypical oceanic crust and its most valuable main geologic resources identified so far are petroleum, together with sand and gravel. Geological research is being carried out with techniques for broad-range swath imaging of the seafloor, such as GLORIA, and for directly measuring the movement between plates. -J.G.Harvey
Oceanus↗
The geology of the Florida Keys
The Florida reefs have evolved over the last 7000 years during rising sea level. An ancient reef existed from sand shoals on which Miami and Key West are now sited before the last glaciation (100 000 to 125 000 years ago). During the glacial period sea level fell to >300 feet below its present level. Since sea level rose again invading the south Florida shelf again, corals have returned. The bulk of the Florida reef tract is composed of carbonate sand, some coming from corals but most from calcified algae. Future scenarios are considered for the Florida reefs assuming sea level to remain stable or to continue to rise. -J.G.Harvey
Oceanus↗