Dinosaurs, pollen and spores, and the age of the Ojo Alamo Sandstone, San Juan Basin, New Mexico
James E. Fassett, S. G. Lucas, F.M. O’Neill
1987, GSA Special Papers (209) 17-34
The Ojo Alamo Sandstone of the San Juan Basin of New Mexico is composed of interbedded conglomeratic sandstone, sandstone, siltstone, and mudstone. Conglomerates are found in the western part of the basin; siliceous pebbles diminish in size both southward and eastward across the basin, becoming rare to nonexistent in the...
The ages of the continental, Upper Cretaceous, Fruitland Formation and Kirtland Shale based on a projection of ammonite zones from the Lewis Shale, San Juan Basin, New Mexico and Colorado
James E. Fassett
1987, GSA Special Papers (209) 5-16
The Kirtland Shale or Fruitland Formation directly underlies the Cretaceous-Tertiary boundary throughout most of the San Juan Basin of northwest New Mexico and southwest Colorado. These formations have been known to be Late Cretaceous in age since the early 1900s. Now, with the greatly renewed interest in rocks adjacent to...
Preliminary results from a study of natural slope failures triggered by the storm of November 3.5.1985, Germany Valley, West Virginia and Virginia: Chapter 4 in Landslides of eastern North America
Robert B. Jacobson, Elizabeth D. Cron, John P. McGeehin
1987, Circular 1008-4
During the first five days of November 1985, a low-pressure system in the Ohio River valley combined with a low-pressure system referred to as Tropical Storm Juan to produce heavy rainfall in the Potomac, James, and Rappahannock River basins. Severe flooding accompanied the rainfall; 43 lives were lost and the...
Colorado Plateau
William L. Graf, Richard Hereford, Julie Laity, Richard A. Young
1987, Book chapter, Geomorphic systems of North America
Field studies in the Colorado Plateau occupy an honored place in the development of geomorphic theory. The purpose of this chapter is to briefly review the foundational, regional, and process-oriented studies in the region, and to provide a review of promising threads of inquiry set in a context of more...
Geology of the Mount St. Helens area: Record of discontinuous volcanic and plutonic activity in the Cascade Arc of southern Washington
Russell C. Evarts, Roger P. Ashley, J.G. Smith
1987, Journal of Geophysical Research B: Solid Earth (92) 10155-10169
The Quaternary edifice of Mount St. Helens volcano was built upon a deeply eroded terrane of gently folded and altered volcanic and plutonic rocks that represent the core of the Tertiary Cascade magmatic arc. These rocks constitute an east dipping homoclinal sequence, several kilometers thick, of subaerially erupted mafic to...
Synopsis of wetland functions and values: bottomland hardwoods with special emphasis on eastern Texas and Oklahoma
D.L. Wilkinson, K. Schneller-McDonald, R.W. Olson, G.T. Auble
1987, Report, Biological Report
Bottomland hardwood wetlands are the natural cover type of many floodplain ecosystems in the southeastern United States. They are dynamic, productive systems that depend on intermittent flooding and moving water for maintenance of structure and function. Many of the diverse functions performed by bottomland hardwoods (e.g., flood control, sediment trapping,...
On the aftershock sequence of the earthquake of January 31, 1986 in northeastern Ohio; effects of bandwidth and local geology on observed high-frequency ground motion
Roger D. Borcherdt, G. Glassmoyer
1987, Conference Paper, Earthquake ground motion estimation in eastern North America proceedings
No abstract available....
Lead isotopic fingerprinting of tectono-stratigraphic terranes, east-central Alaska
John N. Aleinikoff, Cynthia Dusel-Bacon, Helen Laura Foster, Warren J. Nokleberg
1987, Canadian Journal of Earth Sciences (24) 2089-2098
Common lead isotopic compositions have been determined on feldspars from meta-igneous rocks from nine tectono-stratigraphic terranes or subterranes in east-central Alaska. Most of the terranes have distinct and well-defined signatures in terms of isotopic composition; thus, most can be distinguished on conventional...
Variation of wet deposition chemistry in Sequoia National Park, California
Thomas J. Stohlgren, David J. Parsons
1987, Atmospheric Environment (21) 1369-1374
Sequoia National Park has monitored wet deposition chemistry in conjunction with the National Atmospheric Deposition Program and National Trends Network (NADP/NTN), on a weekly basis since July, 1980. Annual deposition of H, NO3 and SO4 (0.045, 3.6, and 3.9 kg ha−1 a−1, respectively) is relatively low compared to that measured...
Ascaulocardium armatum (Morton 1833), new genus (Late Cretaceous): the ultimate variation on the bivalve paradigm
J. Pojeta Jr., N. F. Sohl
1987, Journal of Paleontology (61)
Cretaceous clavagellid pelecypods are a poorly known group, and have previously received little study. Ascaulocardium armatum is conchologically the most complex burrowing pelecypod known. From the study of living clavagellids, it is possible to interpret the various tubes extending outward from the adventitious crypt of A. armatum as devices...
Geology and origin of the Death Valley uranium deposit, Seward Peninsula, Alaska
Kendell A. Dickinson, Kenneth D. Cunningham, Thomas A. Ager
1987, Economic Geology (82) 1558-1574
A uranium deposit discovered in 1977 in western Alaska, by means of airborne radiometric data, is the largest known in Alaska on the basis of industry reserve estimates. At about latitude 65 degrees N, it is the most northerly known sandstone-type uranium deposit in the world. The deposit lies in...
Resurrection Peninsula and Knight Island ophiolites and recent faulting on Montague Island, southern Alaska
Steven W. Nelson, Marti L. Miller, Julie A. Dumoulin
1987, Book chapter, Cordilleran section of the Geological Society of America: Centennial Field Guide volume 1
The Resurrection Peninsula forms the east side of Resurrection Bay (Fig. 1). The city of Seward is located at the head of the bay and can be reached from Anchorage by highway (127 mi;204 km). Relief ranges from 1,434 ft (437 m) at the southern end of the peninsula...
Gulf trough: The Atlantic connection
Peter Popenoe, Vernon J. Henry, Faisal M. Idris
1987, Geology (15) 327-332
Analyses of seismic reflection profiles and stratigraphic data indicate a continuation of the Gulf trough trend across eastern South Carolina and offshore between Cape Fear and Cape Hatteras, North Carolina. Seismic profiles show a linear northeast-trending zone of nondeposition and erosion and areas...
Did the 1982-1983 El Niño-Southern Oscillation Affect Seabirds in Alaska?
Scott A. Hatch
1987, The Wilson Bulletin (99) 468-474
The causes and effects of the oceanographic and atmospheric phenomena known as El Nino and the Southern Oscillation (ENSO) have been studied intensively in recent years (Cane 1983, Rasmusson and Wallace 1983, Barber and Chave 1983, Cane and Zebiak 1985). ENSOs occur at semiregular intervals of 3-4 years, and the...
Trend analysis of monthly sulfur dioxide emissions in the conterminous United States, 1975-1984
H.F. Lins
1987, Atmospheric Environment (21) 2297-2309
Trends in monthly sulfur dioxide emissions for the 48 conterminous United States during the decade 1975-1984 are identified using a robust nonparametric procedure. Statistically significant downward trends are indicated in 32 States, upward trends appear in 10 States, and no significant trend is apparent in six States. Geographically, a distinct...
Marine and nonmarine gas-bearing rocks in Upper Cretaceous Blackhawk and Neslen Formations, eastern Uinta Basin, Utah: Sedimentology, diagenesis, and source rock potential
Janet K. Pitman, Karen J. Franczyk, Donald E. Anders
1987, American Association of Petroleum Geologists Bulletin (71) 76-94
The Upper Cretaceous Blackhawk and Neslen Formations in the eastern Uinta basin contain large amounts of thermogenic gas that was generated from interbedded humic-rich source rocks. The geometry and distribution of hydrocarbon source and reservoir rocks are controlled by depositional environment. The Blackhawk, composed of laterally extensive sandstone and locally...
Source of lead and mineralizing brines for rossie-type Pb-Zn veins in the Frontenac axis area, New York ( USA).
Robert Ayuso, Nora K. Foley, C. Erwin Brown
1987, Economic Geology (82) 489-491
Veins composed mainly of calcite and some galena, sphalerite, fluorite, and other minerals are widespread in the Frontenac axis area of New York and Ontario. In New York, the veins (Fig. 1) occur mainly west and northwest of Gouverneur (Brown, 1983). The veins, mined in the 1800s for lead,...
Lower Paleozoic carbonate rocks of the Baird Mountains quadrangle, western Brooks Range, Alaska
Julie A. Dumoulin, Anita G. Harris
Irvin L. Tailleur, Paul Weimer, editor(s)
1987, Book chapter, Alaskan North Slope Geology, Volumes I and II (SEPM Book 50)
Lower Paleozoic carbonate rocks in the Baird Mountains quadrangle form a relatively thin, chiefly shallow-water succession that has been thrust-faulted and metamorphosed to blueschist and greenschist facies. Although this succession was thought to be mostly Devonian until recently, a large part of it is in fact pre-Silurian in age.Middle and...
Solute geochemistry of the Snake River plain regional aquifer system, Idaho and eastern Oregon
Warren W. Wood, Walton H. Low
1987, Open-File Report 86-247
Three geochemical methods were used to determine chemical reactions that control solute concentrations in the Snake River Plain regional aquifer system: (1) Calculation of a regional solute balance within the aquifer and of mineralogy in the aquifer framework to identify solute reactions, (2) comparison of thermodynamic mineral saturation indices with...
Geology and hydrology of the deep bedrock aquifers in eastern Colorado
S. G. Robson, E. R. Banta
1987, Water-Resources Investigations Report 85-4240
Deep bedrock aquifers are present in rocks of Cretaceous through Pennsylvanian age in eastern Colorado. These aquifers are the Laramie-Fox Hills (the uppermost aquifer studied), Fort Hays-Codell, Dakota-Cheyenne, Entrada-Dockum, Lyons, and Fountain. Structural mapping indicates the aquifers are 2,000 to 9,000 ft below land surface in most of eastern Colorado...
Evolution, biogeography, and systematics of Puriana: evolution and speciation in Ostracoda, III.
T. M. Cronin
1987, Journal of Paleontology (61)
Three types of geographic isolation—land barriers, deep water barriers, and climatic barriers—resulted in three distinct evolutionary responses in Neogene and Quaternary species of the epineritic ostracode genus Puriana. Through systematic, paleobiogeographic, and morphologic study of several hundred fossil and Recent populations from the eastern Pacific, western Atlantic,...
Character and distribution of borehole breakouts and their relationship to in situ stresses in deep Columbia River basalts
Frederick L. Paillet, K. Kim
1987, Journal of Geophysical Research Solid Earth (92) 6223-6234
The character and distribution of borehole breakouts in deeply buried basalts at the Hanford Site in south central Washington State are examined in light of stress indicator data and hydraulic-fracturing stress data by means of acoustic televiewer and acoustic waveform logging systems. A series of boreholes penetrating the Grande Ronde...
The Steens Mountain (Oregon) geomagnetic polarity transition: 3. Its regional significance
E. A. Mankinen, E.E. Larson, C. S. Grommé, M. Prevot, R. S. Coe
1987, Journal of Geophysical Research B: Solid Earth (92) 8057-8076
Study of the variations of direction and intensity of the geomagnetic field as recorded by the Miocene lava flows on Steens Mountain, southeastern Oregon, has resulted in a detailed description of total field behavior during a reversal in polarity. In addition to information about the polarity reversal itself, the detailed...
Modeling and analysis of direct-current electrical resistivity in the Durham Triassic basin, North Carolina
C. Erwin Brown
1987, Geoexploration (24) 429-440
Sixty-two Schlumberger electrical soundings were made in the Durham Triassic basin in an effort to determine basin structural geometry, depth of the sedimentary layers, and spatial distribution of individual rock facies. A digital computer program was used to invert the sounding curves of apparent resistivity versus distance to apparent resistivity...
Possible Late Middle Ordovician organic carbon isotope excursion: Evidence from Ordovician oils and hydrocarbon source rocks, mid-continent and east-central United States
Joseph R. Hatch, Stephen R. Jacobson, Brian J. Witzke, J. Bruno Risatti, Donald E. Anders, W. Lynn Watney, K. David Newell, April K. Vuletich
1987, American Association of Petroleum Geologists Bulletin (71) 1342-1354
Oils generated by Middle Ordovician rocks are found throughout the Mid-Continent and east-central regions of the United States. Gas chromatographic characteristics of these oils include a relatively high abundance of n-alkanes with carbon numbers less than 20, a strong predominance of odd-numbered n-alkanes between C10 and C20, and relatively small amounts...
