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Redescriptions of some Lower Devonian gastropods from Tennessee currently considered to be platyceratids
EDWARD MILLER’S CONTRIBUTIONS TO THE GEOLOGY OF THE ALLEGHENY PORTAGE RAILROAD (PENNSYLVANIA, U.S.A.)
A geochemical context for stray gas investigations in the northern Appalachian Basin: Implications of analyses of natural gases from Neogene-through Devonian-age strata
Abstract Carbonate and interbedded siliciclastic-carbonate rocks of the Upper Cambrian Gatesburg Formation represent deposition on, and proximate to, the great American carbonate bank (GACB), a broad, rimmed platform of low relief that was subject to periodic sea level changes. This environmental setting produced a series of complex mixed carbonate and carbonate-siliciclastic sequences (dominated by carbonates) with limited lateral continuity between outcrops and wells. Many of the rocks formed on the GACB are targets of active petroleum exploration in western and north-central Pennsylvania, as well as in other areas of the Appalachian Basin. Potential reservoir targets include the Upper Cambrian Upper Sandy member of the Gatesburg Formation (Rose Run Sandstone of Kentucky and Ohio) and paleotopo-graphic highs and paleokarstin the Mines Member of the Gatesburg Formation below the Knox unconformity (considered to be part of the Beekmantown throughout much of the Appalachian Basin). Although the latter typically are seismic plays, with companies searching for both stratigraphic and structural traps, knowledge of the patterns of sedimentation on the GACB is also critical to exploration efforts. Mixtures of carbonate and siliciclastic rocks resulted from spatial and temporal variability in depositional systems across the GACB, creating acute and complex reservoir heterogeneities. The distribution of porous and permeable sandstone and carbonate facies within the Cambrian sequence, as well as the juxtaposition of sandstones and paleokarst beneath the Knox unconformity, undoubtedly influenced the migration of fluids, including brines that diagenetically altered many of the rocks, primarily through dolomiti-zation. The spatial distribution of reservoir seals, reservoir compartmentalization, and dia-genetically controlled pore geometry are partially or wholly sedimentologic features.
Unconventional natural gas resources in Pennsylvania: The backstory of the modern Marcellus Shale play
The history and geology of the Allegheny Portage Railroad, Blair and Cambria Counties, Pennsylvania
Abstract The Allegheny Portage Railroad, just one leg of the Pennsylvania Mainline Canal system, was the first railroad over the Allegheny Mountains, an imposing physiographic barrier to westward migration in the early 1800s. Construction of the canal system began in 1826 and continued until ca. 1840 without interruption. The Allegheny Portage Railroad began construction in 1831 and opened for business in 1834. This astonishing engineering feat took less than four years for completion, despite the necessity of 10 inclined planes and the use of the new-fangled railroad locomotives. Construction made use of many of the natural resources occurring along and adjacent to the right-of-way, especially the Pennsylvanian-aged sandstones used for the “sleepers” that held the rails in place. Travel occurred in sectional canal boats, boats that were built in two or three pieces that could be easily loaded onto rail cars. Passengers and goods were loaded onto the boat sections in Philadelphia, which were then hauled by horse or locomotive to the Susquehanna River west of Lancaster. The boats traveled north on the Susquehanna River canal to the mouth of the Juniata River north of Harrisburg, then along the Juniata River canal to Hollidaysburg near the foot of Allegheny Mountain. There, the boats were taken from the water, loaded onto rail cars, and hauled over the mountain on the Allegheny Portage Railroad to Johnstown where they were unloaded into the Conemaugh River canal for the journey to Pittsburgh. A New Allegheny Portage Railroad was built in the 1850s to bypass the inclined planes. It was no sooner built, however, when the state sold the entire canal system to the Pennsylvania Railroad for less than half the cost of construction. The Pennsylvania Railroad promptly dismantled the Allegheny Portage Railroad and filled in the canals. Today, the Allegheny Portage Railroad National Historic Site oversees and administers the preservation of the few remaining aspects of the old railroad.
The history and geology of the Allegheny Portage Railroad, Blair and Cambria Counties, Pennsylvania
Abstract The Allegheny Portage Railroad, just one leg of the Pennsylvania Mainline Canal system, was the first railroad over the Allegheny Mountains, an imposing physiographic barrier to westward migration in the early 1800s. Construction of the canal system began in 1826 and continued until ca. 1840 without interruption. The Allegheny Portage Railroad began construction in 1831 and opened for business in 1834. This astonishing engineering feat took less than four years for completion, despite the necessity of 10 inclined planes and the use of the new-fangled railroad locomotives. Construction made use of many of the natural resources occurring along and adjacent to the right-of-way, especially the Pennsylvanian-aged sandstones used for the “sleepers” that held the rails in place. Travel occurred in sectional canal boats, boats that were built in two or three pieces that could be easily loaded onto rail cars. Passengers and goods were loaded onto the boat sections in Philadelphia, which were then hauled by horse or locomotive to the Susquehanna River west of Lancaster. The boats traveled north on the Susquehanna River canal to the mouth of the Juniata River north of Harrisburg, then along the Juniata River canal to Hollidaysburg near the foot of Allegheny Mountain. There, the boats were taken from the water, loaded onto rail cars, and hauled over the mountain on the Allegheny Portage Railroad to Johnstown where they were unloaded into the Conemaugh River canal for the journey to Pittsburgh. A New Allegheny Portage Railroad was built in the 1850s to bypass the inclined planes. It was no sooner built, however, when the state sold the entire canal system to the Pennsylvania Railroad for less than half the cost of construction. The Pennsylvania Railroad promptly dismantled the Allegheny Portage Railroad and filled in the canals. Today, the Allegheny Portage Railroad National Historic Site oversees and administers the preservation of the few remaining aspects of the old railroad.
Establishing a Regional Geologic Framework for Carbon Dioxide Sequestration Planning: A Case Study
Abstract A regional-scale, digital geologic model was created for carbon sequestration planning in the Michigan and north-central Appalachian sedimentary basins. This regional model and database include well data (picks) from more than 85,000 locations, structure and isopach maps for target and confining rock layers, and oil- and gas-field boundaries with production and petrophysical data. This model confirms the wide range of sequestration options available in the seven-state region. Target sequestration layers include coal and shales rich in organic matter (for CO 2 -enhanced methane recovery) and sandstones and carbonates with sufficient porosity to support enhanced oil recovery and disposal in saline formations. Maps created for this study are compared to those from previous compilations to illustrate advances in geologic understanding and to identify topics for future research. In addition, the utility of the Geographic Information System database in planning and decision support is presented through maps used to select study sites and through the use of the new structure and isopach models in sequestration capacity estimates. These derived products demonstrate that the study region has many promising sequestration targets with the combined capacity to contain hundreds of years of CO 2 production emitted from coal-burning power plants and other point industrial sources.
Oil and Gas Developments in Mid-Eastern States in 1989
Oil and Gas Development in Mid-Eastern States in 1988
Occurrence of a cephalopod aptychus in the Ames Limestone (Virgilian) of western Pennsylvania
Oil and Gas Developments in Mid-Eastern States in 1987
Oil and Gas Developments in Mid-Eastern States in 1986
Oil and Gas Developments in Mid-Eastern States in 1985
Abstract Most Upper Devonian and Lower Silurian reservoirs in Pennsylvania have stratigraphic traps (pinch-outs, porosityture trends throughout western Pennsylvania probably influenced the migration of fluids and the diagenesis of sediments. Reservoirs comprise a variety of quartzose, lithic, and feld- spathic sandstones whose diagenetic histories included formation of authigenic clays, cementation, dolomitization, solution of cements and grains (resulting in secondary porosity development), and recementation. Permeabilities and porosities (most of which are secondary) tend to be low.