I. Intrusive rocks of eastern Massachusetts, by D. R. Wones, Virginia Polytechnic Institute and State University; and Richard Goldsmith, U.S. Geological Survey. p. 11-161.

J. Radiometric ages of rocks in Massachusetts, by R. E. Zartman and R. F. Marvin, U.S. Geological Survey. p. J1-J19.

BULLETINS

Bulletins contain significant data and interpretations that are of lasting scientific interest but are generally more limited in scope or geographic coverage than professional papers. They include the results of resource studies and of geologic and topographic investigations; as well as collections of short papers related to a specific topic.

B 1565. Lexicon of new formal geologic names of the United States 1981-1985, by G. W. Luttrell, M. L. Hubert and C. R. Murdock. 1991. 376 p. $24.

The lexicon contains brief descriptions of new formal geologic names in the United States and Puerto Rico introduced into the literature in the years 1981 through 1985.

B 1724-E. MONTANA. Mineral resources of the Sleeping Giant Wildemess Study Area, Lewis and Clark County, Montana, by R. G. Tysdal, M. W. Reynolds, R. R. Carlson, M. D. Kleinkopf, L. C. Rowan, U.S. Geological Survey; and T. J. Peters, U.S. Bureau of Mines. 1991. p. E1-E31. 1 plate in pocket. (Mineral resources of wilderness study areas; westem Montana.) $2.75.

A mineral resource survey was conducted in 1987 by the U.S. Geological Survey and the U.S. Bureau of Mines to evaluate mineral resources (known) and mineral resource potential (undiscovered) of the Sleeping Giant Wildemess Study Area (MT075-111) in Lewis and Clark County, Montana. The only economic resource in the study area is an inferred 1.35-million-ton reserve of decorative stone (slate); a small gold placer resource is subeconomic. A high resource potential for decorative slate exists directly adjacent to the area of identified slate resource and in the northeastern part of the study area. The rest of the study area has a low potential for decorative slate. The westemmost part of the study area has a moderate resource potential for copper and associated silver in strata-bound deposits in green beds and limestone; potential is low in the rest of the study area. The study area has a low resource potential for sapphires in placer deposits, gold in placer deposits (exclusive of subeconomic resource mentioned above), phosphate in the Spokane Formation, diatomite in lake deposits, uranium, oil, gas, geothermal energy, and no resource potential for phosphate in the Phosphoria Formation.

B 1748-B. UTAH. Mineral resources of the Paria-Hackberry Wilderness Study Area, Kane County, Utah, by Henry Bell III, A. L. Bush, R. L. Tumer, J. W. Cady, U.S. Geological Survey; S. D. Brown, B. J. Hannigan, and J. R. Thompson, U.S. Bureau of Mines. 1991. p. B1-B17. 1 plate in pocket. (Mineral resources of wildemess study areas; the Cockscomb region, Utah.) (Supersedes Open-file report 90-453.) $2.25.

The Paria-Hackberry Wildemess Study Area, in central Kane County, southern Utah, is a region of generally flat-lying, gently folded Jurassic and Cretaceous sedimentary rocks bounded on the east by the east-dipping limb of the East Kaibab Monocline and cut by sheer-walled, narrow canyons. The area selected for study by the U.S. Bureau of Land Management totaled 94,642 acres (148 square miles); because of uncertainty as to final boundaries, the U.S. Geological Survey studied an additional contiguous

41,180 acres (64 square miles). No identified resources of metals or nonmetallic minerals are present in the study area. An unsuccessful attempt to recover "flour" gold from the Chinle Formation was made in the early part of the century at the now-abandoned townsite of Paria. The mineral resource potential for all metals, including gold, uranium, barium, silver, strontium, arsenic, antimony, mercury, copper, manganese, cadmium, and zinc, is low for the entire Paria-Hackberry Wildemess Study Area. The likelihood of occurrence of "decorative-use" gypsum and of sand and gravel is moderate in limited areas of the northern part of the wilderness study area and, for sand and gravel, in a few small occurrences along the Paria River valley. A moderate energy resource potential is assessed for oil and gas and a low potential for geothermal energy, for the entire study area. There is no energy resource potential for coal.

B 1759-C. WYOMING. Mineral resources of the Devils Playground and Twin Buttes Wildemess Study Areas, Sweetwater County, Wyoming, by R. E. Van Loenen, W. A. Bryant, U.S. Geological Survey; and M. E. Lane, U.S. Bureau of Mines. 1991. p. C1-C9. (Mineral resources of wildemess areas; miscellaneous states.) $1.75.

The Devils Playground and Twin Buttes Wildemess Study Areas are contiguous, covering an area totalling 26,800 acres in Southwest Wyoming. The study areas have been withdrawn from mining claim location because of the rich oil shale deposits in the region. In addition, Minerals Management Service considers the areas to have moderate development potential for sodium (trona), with as much as 1.2 billion tons of inferred resources. The study areas are classic sites for vertebrate fossils, yielding many thousands of specimens now in museums. Chert beds are common, and it is prized by collectors for its banded appearance. The study areas have a high resource potential for undiscovered natural gas. The study areas have a moderate potential for zeolites. A low potential exists for coal resources (coal is present at great depths) and for undiscovered metallic minerals.

B 1787-S,T. UTAH. Petrology and depositional setting of Mississippian rocks associated with an anoxic event at Samak, western Uinta Mountains, Utah. Petrology and significance of a Mississippian (Osagean-Meramecian) anoxic event, Lakeside Mountains, northwestern Utah, by K. M. Nichols and N. J. Silberling. 1991. 25 p. (Evolution of sedimentary basins; Uinta and Piceance basins.) (Chapters S and T are published together as a single volume and are not available separately.) $2.25.

A multidisciplinary approach to research studies of sedimentary rocks and their constituents and the evolution of sedimentary basins, both ancient and modern.

S. Petrology and depositional setting of Mississippian rocks associated with an anoxic event at Samak, westem Uinta Mountains, Utah, by K. M. Nichols and N. J. Silberling. p. S1S13.

T. Petrology and significance of a Mississippian (OsageanMeramecian) anoxic event, Lakeside Mountains, northeaster Utah, by K. M. Nichols and N. J. Silberling. p. TI-T12.

B 1787-V. UTAH. Late Paleozoic structure of the southern part of the Uinta Basin, Utah, from seismic reflection data, by C. J. Potter, U.S. Geological Survey; Rex Tang, Louisiana Land and Exploration Co., Denver; and T. J. Hainsworth, Aurora, Colo

rado. 1991. p. V1-V10. 1 plate in pocket. (Evolution of sedimentary basins; Uinta and Piceance basins.) $1.25.

A network of oil-industry seismic reflections lines that reveal buried Pennsylvanian and Permian faulting patterns is presented and discussed. The fault patterns are related to Ancestral Rockies orogenesis; some of the faults have not been reactivated during the Mesozoic and Cenozoic. Four seismic reflection lines are presented in detail.

B 1866-H. OKLAHOMA. Composition, clay mineralogy, and diagenesis of the Simpson Group (Middle Ordovician), Grady County, Oklahoma, by R. M. Pollastro. 1991. p. H1-H19. (Evolution of sedimentary basins; Anadarko Basin.) $1.75.

X-ray powder diffraction and petrographic analyses of more than 100 core samples of the Middle Ordovician Simpson Group recovered at present depths between about 15,900 and 17,200 ft demonstrate the extent of diagenetic change in mineralogy and texture under deep burial conditions. Pervasive carbonate cements evolve from early iron-poor calcites to iron-rich calcite, dolomite, or ankerite. Illite and iron-rich chlorite are the main clay minerals and were transformed from earlier more expandable clays and also precipitated as cement. Local secondary porosity in some samples results from the dissolution of intergranular carbonate cement.

B 1904-I. Evidence for continental crustal assimilation in the Hemlock Formation flood basalts of the early Proterozoic Penokean Orogen, Lake Superior region, by J. W. Beck and V. R. Murthy, University of Minnesota. 1991. p. 11-125. (Contributions to Precambrian geology of Lake Superior region; edited by P. K. Sims and L. M. H. Carter.) $2.

Two major suites of mafic volcanic and intrusive rocks are juxtaposed across the Niagara fault zone within the central part of the Penokean Orogen. Neodymium isotopic systematics, geochemical characteristics, and tectonic settings suggest that north of the fault zone rocks possibly were erupted during a major rifting event in the early Proterozoic, but rocks south of the fault zone reflect mixing of an early Proterozoic juvenile basaltic component with a continental-crustal light rare earth element-enriched component.

B 1952. NEW JERSEY. Contributions to New Jersey geology, edited by A. A. Drake, Jr., U.S. Geological Survey. Prepared in cooperation with the New Jersey Geological Survey. 1991. 42 p. $3.50.

Geologic mapping for the New Jersey State Map shows that middle Proterozoic intrusive rocks there can be assigned to three units. These rocks are described and their environment of emplacement is interpreted. In addition, a new member of the Ordovician Martinsburg Formation is described and its environment of deposition is interpreted.

A. The Lake Hopatcong Intrusive Suite (middle Proterozoic) of the New Jersey Highlands, by A. A. Drake, Jr., U.S. Geological Survey; and R. A. Volkert, New Jersey Geological Survey. p. A1-A9.

B. The High Point Member (Upper Ordovician) of the Martinsburg Formation in northern New Jersey and southeastern New York, by A. A. Drake, Jr., U.S. Geological Survey. p. B1-B9.

C. The Mount Eve Granite (middle Proterozoic) of northem New Jersey and southeastern New York, by A. A. Drake, Jr., J.

N. Aleinikoff, U.S. Geological Survey; and R. A. Volkert, New Jersey Geological Survey. p. C1-C10.

D. The Byram Intrusive Suite of the Reading Prong: age and tectonic environment, by A. A. Drake, Jr., J. N. Aleinikoff, U.S. Geological Survey: and R. A. Volkert, New Jersey Geological Survey. p. D1-D14.

B 1959. Chloride flux and surface water discharge out of Yellowstone National Park, 1982-1989, by D. R. Norton and Irving Friedman. 1991. 42 p. $2.75.

The major source of chloride in Yellowstone National Park is hydrothermal, and chloride flux is a measure of heat flow from the geothermal source. Tabulation of water discharge, chloride concentration, and chloride flux is given for rivers and streams in the Yellowstone area. All show variations in water discharge and chloride flux, some of which are seasonal. Nonseasonal variations are attributed to changes in thermal activity.

B 1963. IDAHO. Zeolitic diagenesis of tuffs in the Miocene Chalk Hills Formation, western Snake River plain, Idaho, by R. A. Sheppard. 1991. 27 p. $2.

The Chalk Hills Formation consists of about 100 m of mainly mudstone, siltstone, and interbedded vitric tuffs that were deposited in a chiefly freshwater lake. Throughout most of the outcrop belt, the tuffs are unaltered, but, south of Oreana, the tuffs are completely altered to clinoptilolite with or without smectite and opal-CT. The zeolites and associated silicate minerals undoubtedly formed during diagenesis by hydrolysis and dissolution of rhyolitic glass by pore water that was trapped in the tuffs during lacustrine sedimentation.

B 1971. Field studies of radon in rocks, soils, and water, edited by L. C. S. Gundersen and R. B. Wanty, U.S. Geological Survey. 1991. 334 p. $18.

This bulletin is a diverse collection of geologic, hydrologic, geochemical, and geophysical studies of radon in rocks, soils, and water. Radon is a radioactive gas, the product of the radioactive decay of uranium and the second leading cause of lung cancer in humans. In this volume, the various techniques used to measure radon in water, soil, and air are discussed; geologic case studies of radon in soils and water derived from faults, metamorphic, igneous, and sedimentary rocks are examined; and models for assessing radon regionally are presented.

Methods of characterization of ground for assessment of indoor radon potential at a site, by A. B. Tanner, U.S. Geological Survey. p. 1-13.

Simple techniques for soil-gas and water sampling for radon analysis, by G. M. Reimer, U.S. Geological Survey. p. 1922.

A preliminary evaluation of environmental factors influencing day-to-day and seasonal soil-gas radon concentrations, by Sigrid Asher-Bolinder, D. E. Owen, and R. R. Schumann, U.S. Geological Survey. p. 23-31.

Derivation of radon migration rates in the surficial environment by use of helium injection experiments, by G. M. Reimer, U.S. Geological Survey. p. 33-38.

Radon in sheared metamorphic and igneous rocks, by L. C. S. Gundersen, U.S. Geological Survey. p. 39-50.

The geology and geochemistry of soils in Boyertown and Easton, Pennsylvania, by S. S. Agard and L. C. S. Gundersen, U.S. Geological Survey. p. 51-63.

Radon in soil gas and gamma-ray activity of rocks and soils at the Mulligan Quarry, Clinton, New Jersey, by M. E. Henry, U.S. Geological Survey; M. E. Kaeding, and D. H. Monteverde, New Jersey Geological Survey. p. 65-75.

Radon in soil gas along active faults in Central California, by Chi-Yu King, Calvin Walkingstick, Jr., and D. S. Basler, U.S. Geological Survey. p. 77-143.

Radon emanation from uranium mill tailings, by E. R. Landa, U.S. Geological Survey. p. 145-154.

Use of aerial gamma-ray data to estimate relative amounts of radon in soil gas, by J. S. Duval, U.S. Geological Survey. p. 155-162.

Regional radon characterizations, by R. T. Peake, U.S. Environmental Protection Agency; and R. R. Schumann, U.S. Geological Survey. p. 163-175.

Reconnaissance approach to using geology and soil-gas radon concentrations for making rapid and preliminary estimates of indoor radon potential, by G. M. Reimer, L. C. S. Gundersen, S. L. Szarzi, and J. M. Been, U.S. Geological Survey. p. 177-181.

A review of the chemical processes affecting the mobility of radionuclides in natural waters, with applications, by R. B. Wanty and Robert Schoen, U.S. Geological Survey. p. 183194.

Radionuclides in ground water, rock and soil, and indoor air of the Northeastern United States and southeastern Canada; a literature review and summary of data, by R. T. Paulsen, The Paulsen Group. p. 195-225.

Sampling and analysis of dissolved radon-222 in water by the de-emanation method, by L C. Yang, U.S. Geological Survey. p. 227-230.

A comparison of two techniques for radon-222 measurement in water samples, by A. H. Mullin and R. B. Wanty, U.S. Geological Survey. p. 231-236.

Use of radon measurements in Carters Creek, Maury County, Tennessee, to determine location and magnitude of ground-water seepage, by R. W. Lee and E. F. Hollyday, U.S. Geological Survey. p. 237-242.

Geologic and geochemical factors controlling uranium, radium226, and radon-222 in ground water, Newark Basin, New Jersey, by Zoltan Szabo and O. S. Zapecza, U.S. Geological Survey; prepared in cooperation with the New Jersey Department of Environmental Protection. p. 243-265.

Radium-226, radium-228, and radon-222 in ground water of the Chickies Quartzite, southeastern Pennsylvania, by L. D. Cecil, L. A. Senior, and K. L. Vogel, U.S. Geological Survey. p. 267-277.

Radon in ground water of Carson Valley, west-central Nevada, by M. S. Lico and T. G. Rowe, U.S. Geological Survey. p. 279-288.

Geochemistry of ground water and radionuclide mobility in two areas of the Reading Prong, eastern Pennsylvania, by R. B. Wanty, P. H. Briggs, and L. C. S. Gundersen, U.S. Geological Survey. p. 289-296.

Radionuclides in the Puerco and lower Little Colorado River basins, New Mexico and Arizona, before 1987, by J. R. Gray and R. H. Webb, U.S. Geological Survey. p. 297-311.

Uranium, radium, and radon in deeply buried sediments of the U.S. Gulf Coast, by T. F. Kraemer, U.S. Geological Survey. p. 313-318.

Radon, helium, and other gases in shallow ground waters of uraniferous Holocene alluvium, Flodelle Creek, Stevens County, Northeast Washington, by J. K. Otton and G. M. Reimer, U.S. Geological Survey. p. 319-334.

B 1972. NEW MEXICO. Coalfields of New Mexico; geology and resources, edited by C. L. Molnia, D. A. Jobin, J. T. O'Connor, U.S. Geological Survey; and F. E. Kottlowski, New Mexico Bureau of Mines and Mineral Resources. Prepared in cooperation with the New Mexico Bureau of Mines and Mineral Resources. 1991. 77 p. $4.50.

The State Geologist of New Mexico and the U.S. Geological Survey here describe the primary geologic factors that influence the quantity and accessibility of the State's coal resources. The report emphasizes the San Juan Basin, the area that contains most of the past and present resources, but also includes chapters on the Raton Coalfield and the State's smaller fields. It gives brief geological descriptions of the coalfields, estimates of the coal resources, analyses of the probable accuracy of the estimates, thicknesses of the coal beds, and discussions of geologic factors that affect the resources. The report demonstrates the capabilities of the U.S. Geological Survey's National Coal Resources Data System.

A. Geologic framework and major coal-bearing formations of the San Juan Basin, by M. W. Green, J. W. Mytton, D. T. Sandberg, and N. K. Gardner, U.S. Geological Survey. p. 1

14.

B. Coal resources of the San Juan Basin, by L. R. H. Biewick, A. L. Medlin, J. F. Hunter, and K. K. Krohn, U.S. Geological Survey. p. 15-33.

C. Coal resource estimation in the San Juan Basin using geostatistical methods, by L. W. Boger, Jr., and A. L. Medlin, U.S. Geological Survey. p. 35-43.

D. Geology and coal resources of the Raton Coalfield, by C. L. Pillmore, U.S. Geological Survey. p. 45-68.

E. Geology and coal resources of New Mexico's small coalfields, by F. W. Campbell, G. K. Hoffman, F. E. Kottlowski, and B. W. Arkell, New Mexico Bureau of Mines and Mineral Resources. p. 69-77.

B 1973-A-G. WYOMING, UTAH, COLORADO. Geochemical, biogeochemical, and sedimentological studies of the Green River Formation, Wyoming, Utah, and Colorado, edited by M. L. Tuttle, U.S. Geological Survey. 1991. 118 p. (Chapters A-G are issued as a single volume and are not available separately.) $7.50.

During the Paleogene, the Green River Formation was deposited in two large lakes that occupied the greater Green River basin of Wyoming, Piceance Basin of Colorado, and Uinta Basin of Utah. New geochemical, biogeochemical, and sedimentological

data for samples from these three depositional basins provide a basis for a much needed interdisciplinary approach with which to better understand the deposition and diagenesis of the Green River Formation.

A. Introduction, by M. L. Tuttle, U.S. Geological Survey. p. A1-A11.

B. Sulfur geochemistry and isotopy of the Green River Formation, Wyoming, Utah, and Colorado, by M. L. Tuttle and M. B. Goldhaber, U.S. Geological Survey. p. B1-B20.

C. A preliminary study of the carbon and nitrogen isotopic biogeochemistry of lacustrine sedimentary rocks from the Green River Formation, Wyoming, Utah, and Colorado, by J. W. Collister, U.S. Geological Survey; and J. M. Hayes, Indiana University. p. C1-C16.

D. Trace elements in pyrites of the Green River Formation oil shales, Wyoming, Utah, and Colorado, by W. J. Harrison, Colorado School of Mines; D. R. Pevear, Exxon Production Research Co.; and P. C. Lindahl, Argonne National Laboratory. p. D1-D23.

E. An experimental study of goethite sulfidization; relationships to the diagenesis of iron and sulfur, by M. R. Stanton and M. B. Goldhaber, U.S. Geological Survey. p. E1-E20.

F. Effects of source, depositional environment, and diagenesis on characteristics of organic matter in oil shale from the Green River Formation, Wyoming, Utah, and Colorado, by W. E. Dean and D. E. Anders, U.S. Geological Survey. p. F1-F16. G. Petrography of iron sulfide minerals in the Green River Formation of Wyoming, Utah, and Colorado, by M. L. Tuttle, U.S. Geological Survey. p. G1-G12.

B 1978. FLORIDA. Mineralogy and chemistry of samples from a drill hole in the southern extension of the land-pebble phosphate district, Florida, by J. B. Cathcart and Theodore Botinelly. 1991. 25 p. $2.

This report contains the first detailed data on the mineralogy and chemistry of the phosphate rock of the southern extension of the land-pebble district of Florida. Data show that the apatite mineral is more highly substituted and, therefore, has a lower P2O5 content and a higher content of deleterious elements than the apatite of the land-pebble district. Palygorskite is the most abundant clay mineral and ferroan dolomite is the most abundant carbonate mineral in the deposit, whereas montmorillonite and iron-poor dolomite are most abundant in the land-pebble deposits.

B 1985. Shorter contributions to paleontology and stratigraphy, edited by W. J. Sando, U.S. Geological Survey. 1991. 30 p. (Chapters A-F are issued as a single volume and are not available separately.) $5.50.

Six papers present new data on occurrences of biostratigraphically significant mollusks in Upper Cretaceous rocks of Arkansas and Western Interior states in the USA. The ammonite genus Pachydesmoceras is recorded in North America for the first time, and ammonites of the subfamily Texanitinae are recorded from

Campanian rocks in the Western Interior for the first time. The rudistid species Durania cornupastoris is recorded in the Westem Interior for the first time. A new ammonite biozone and the first record of fossils that characterize the Nostoceras alternatum Zone are described from Upper Cretaceous rocks of Arkansas. A rare occurrence of the cosmopolitan ammonite Pachydiscus, previously unrecorded from the Western Interior of the United States, is described.

A. Pachydesmoceras Spath, 1922, a Cretaceous ammonite in Colorado, by W. A. Cobban, U.S. Geological Survey; and W. J. Kennedy, Oxford University. p. A1-A3.

B. New records of the ammonite subfamily Texanitinae in Campanian (Upper Cretaceous) rocks in the Western Interior of the United States, by W. A. Cobban, U.S. Geological Survey; and W. J. Kennedy, Oxford University. p. B1-B4.

C. Some Upper Cretaceous ammonites from the Nacatoch Sand of Hempstead County, Arkansas, by W. A. Cobban, U.S. Geological Survey; and W. J. Kennedy, Oxford University. p. C1C5.

D. Occurrence of the rudistid Durania cornupastoris (Des Moulins, 1826) in the Upper Cretaceous Greenhorn Limestone in Colorado, by W. A. Cobban, U.S. Geological Survey; P. W. Skelton, Open University, Milton Keynes; and W. J. Kennedy, Oxford University. p. D1-D8.

E. Upper Cretaceous (Maastrichtian) ammonites from the Nostoceras alternatum Zone in southwestem Arkansas, by W. A. Cobban, U.S. Geological Survey; and W. J. Kennedy, Oxford University. p. E1-E6.

F. Pachydiscus (Ammonoidea) from Campanian (Upper Cretaceous) rocks in the Western Interior of the United States, by W. A. Cobban, U.S. Geological Survey; and W. J. Kennedy, Oxford University. p. F1-F4.

B 1987. IDAHO. Quantitative mineral resource assessment of selected mineral deposits in the Challis National Forest, Idaho, by M. W. Bultman. 1991. 25 p. $2.

Selected mineral deposits in the Challis National Forest, Idaho, have been quantitatively assessed. The assessment involves three steps classification of mineral deposits, delineation of terranes permissive for the occurrence of mineral deposits, and estimation of the number of undiscovered deposits-followed by a computer simulation. The computer simulation produced estimates of tonnages of metals contained in the selected deposits. This report is a companion publication to U.S. Geological Survey Bulletin 1873 by Worl and others (1989).

B 1990-E. ALASKA. Pollen zonation and correlation of Maastrichtian marine beds and associated strata, Ocean Point dinosaur locality, North Slope, Alaska, by N. O. Frederiksen. 1991. p. E1-E24. (Evolution of sedimentary basins; North Slope Basin.) $2.75.

A composite palynostratigraphic section is constructed for the Ocean Point area along and near the lower Colville River, North Slope of Alaska; this section includes two Maastrichtian (Upper Cretaceous) pollen zones. Pollen correlation with the Brackett Basin, Northwest Territories of Canada, demonstrates that the study section along the lower Colville River is "middle" to latest Maastrichtian in age and that the Ocean Point marine beds are "middle" Maastrichtian.