Southern extension of the NY-AL lineament based on the originally defined features using composite aeromagnetic anomaly maps of the eastern U.S. (King and Zietz, 1978; Steltenpohl et al., 2010b). What time was the earthquake felt in Atlanta? Arcuate northeast-trending magnetic lineaments of the Suwannee terrane reflect internal structure and Mesozoic failed-rift trends that signal the breakup of Pangaea and opening of the Atlantic Ocean, beginning another Wilson cycle (Thomas, 2006). Surface rocks in northernmost Alabama consist of Ordovician to Mississippian and Pennsylvanian carbonate and siliciclastic rocks of the Appalachian foreland. The Uchee terrane has a peri-Gondwanan or Gondwanan origin, requiring that the northwest limit of Bartletts Ferry fault zone must also be the Central Piedmont suture or a later structure that has overprinted the suture (Steltenpohl et al., 2008). Distinct N15°E-trending magnetic low within domain 4. 23. Along with "fold," or the bending of rocks, the movement. thesis], A petrographic and geochemical analysis of the Zana Granite and Kowaliga Augen Gneiss: Northern Piedmont, Alabama [M.S. The Appalachian foreland fold-thrust belt consists of a series of major folds and large imbricate thrust sheets that have a northeast-southwest trend and become continuous with other structures to the northeast in Georgia. 9B. Magnetic gradient 5 loosely follows the southeast boundary of Carboniferous-cored synclines and the Coosa deformed belt (Fig. Beneath the Appalachian Basin in northwestern Alabama, broad deep-crustal anomalies of the continental interior include the Grenville front and New York–Alabama lineament (dextral fault). Steltenpohl (2005) reported oblique normal-and-right-slip movement indicators in several exposures of the Goodwater-Enitachopco fault and noted that a systematic analysis of the geometry, kinematics, and rheologies of the fault rocks was needed. 1) between the ancient Laurentian margin and the peri-Gondwanan arc terranes (Hibbard et al., 2002, 2007; Steltenpohl et al., 2006, 2008). Near the triple point between the Talladega–St. Mesoproterozoic granitic gneiss basement rocks of Pine Mountain window, characterized by low-frequency, broad, flat, only weakly elongate magnetic lows (a magnetic signature grossly similar to that of the Paleozoic granitoids of the eastern Blue Ridge, domains 21 and 23B). Interrupting the continuity within the foreland are several anticlines (Sequatchie and Birmingham; Fig. Separating the eastern Blue Ridge from the Inner Piedmont is the Brevard fault zone (Jonas, 1932; King, 1955; Hatcher, 1978, 2001; Higgins et al., 1988). The last large earthquake to affect London occurred on the 6 April 1580 and was estimated to have been a relatively large magnitude 5.5. The Hayesville-Soque River thrust sheet sits against and partially atop both the Dahlonega gold belt and the western Blue Ridge along both the Hayesville fault and its probable equivalent, the Soque River fault. This Paleozoic quartz diorite batholith (Gault, 1945; Bentley and Neathery, 1970; Russell, 1978; Drummond et al., 1994, 1997) is characterized by a long-wavelength (low-frequency) magnetic pattern that makes it one of the most distinctive units on the magnetic anomaly map. 2; Russell, 1978; Stoddard, 1983; Bieler and Deininger, 1987; Grimes et al., 1997; Drummond et al., 1997; Steltenpohl, 2005). Although the Emuckfaw Formation is known to locally contain minor, thin amphibolite layers (Bentley and Neathery, 1970; Raymond et al., 1988), the aeromagnetic signature of domain 26 suggests that this area contains more-substantial mafic and perhaps even ultramafic material that is not depicted on the state geologic map (Osborne et al., 1988). Alabama (United States) contains several major crustal-lithospheric boundaries that played an important role in J. Tuzo Wilson’s (1966) formulation of what later would become known as the Wilson cycle. The quake was centered roughly four miles southwest of downtown Augusta and went eight miles deep at 11:14 a.m., the U.S. Geological Survey said. Traversing toward the southeast, the first, weak but fine-scale Appalachian magnetic signatures appear with the Hollins line fault (feature 16 in Figs. (2005a) that the Opelika Complex should be reassigned to the eastern Blue Ridge, and that the Dadeville Complex is a very thin allochthonous “scoop-shaped” klippe emplaced during an early stage of development of the Brevard fault zone. The Talladega fault (Fig. 365 Ma, ca. Our observations are that it dips steeply to the southeast and exhibits oblique-normal but predominantly dextral shear, and it is cut by later (Mesozoic?) 3), which has important implications for delimiting the geometry of the most southern surface exposures of the Appalachians. Along the east limb, meta-arkosic schist and gneiss of the Opelika Complex (Inner Piedmont) are lithologically similar to those of the Emuckfaw Group, and both packages are intruded by abundant and similar-appearing granitoid plutons (Steltenpohl et al., 2005a). Geophysical data can be used to make inferences on surface and subsurface geology and vice versa, which has applicability anywhere that bedrock is exposed or concealed beneath essentially non-magnetic sedimentary cover. Aeromagnetic lineaments tracing this anastomosing network of mylonite zones clearly end at the Suwannee-Wiggins suture where lineament 33 (i.e., our projected trace for the Bartletts Ferry fault zone) is truncated by lineament 12 roughly 80 km south of the onlap boundary (Fig. 4) was compiled from databases kept by the National Geophysical Data Center (Dater et al., 1999). 7. Annotated features from Figure 3 layered on the simplified geologic map of Alabama presented in Figure 2. It is inferred to connect northward with the Grenville front of Ontario, Canada, and the adjacent northern U.S. (including the southeast-dipping COCORP seismic reflector interpreted as the Grenville front in western Ohio; Pratt et al., 1989) and southward with the Grenville front directly north of the Llano uplift in Texas (Mosher, 1993; Mosher et al., 2004). 24A and 24B. Questionable segment of the Goodwater-Enitachopco fault as previously mapped (Osborne et al., 1988). Fortunately, it was 60 miles offshore but was still powerful enough to cause minor damage to buildings on the east coast of England. Directly southeast of the Goodwater-Enitachopco fault, Paleozoic granitic plutons, such as the major Elkahatchee Quartz Diorite batholith and smaller bodies of Rockford, Bluff Springs, and Almond granites, occur in the eastern Blue Ridge (Russell, 1978; Drummond et al., 1997; Tull et al., 2009; Schwartz et al., 2011). 35. Geodynamics transect of the Appalachian orogen in Alabama, American Geophysical Union Geodynamics Series, Geologic Profiles of the Northern Alabama Piedmont, Alabama Geological Society Annual Field Trip Guidebook 13, Preliminary interpretation of aeromagnetic and aeroradioactivity maps of the Alabama Piedmont, doi:10.1130/0091-7613(1976)4<375:PIOAAA>2.0.CO;2, Aeromagnetic map of east-central Alabama [preliminary map], Alabama Geological Survey, Stratigraphy and Paleontology Division unpublished map, Aeroradioactivity map of east-central Alabama [preliminary map], General lithology and petrology of the Dadeville Complex, Geology of the Southern Inner Piedmont, Alabama and Southwest Georgia: Geological Society of America, Southeastern Section, 39th Annual Meeting, Field Trip Guidebook VII, Tuscaloosa, Geological Survey of Alabama, Two high-silica gneisses from the Dadeville Complex of Alabama’s Inner Piedmont, Rb-Sr whole rock and inherited zircon ages of the plutonic suite of the Crossnore Complex, southern Appalachians, and their implications regarding the time of opening of the Iapetos Ocean, The Grenville Event in the Appalachians and Related Topics: Geological Society of America Special Paper 194, Extension of the Grenville Basement to southern extremity of the Appalachians, Alabama Geological Survey Special Map 220, Cycles and stacking patterns in Carboniferous rocks of the Black Warrior foreland basin, Cyclothems of the Black Warrior basin in Alabama: Eustatic snapshots of foreland basin tectonism, Sequence Stratigraphy, Paleoclimate, and Tectonics of Coal-Bearing Strata: American Association of Petroleum Geologists Studies in Geology 51, Silurian–Devonian pelecypods and Paleozoic stratigraphy and structure of subsurface rocks in Florida and Georgia and related Silurian pelecypods from Bolivia and Turkey, U.S. Geological Survey Professional Paper 879, Major Proterozoic basement features of the eastern midcontinent of North America revealed by recent COCORP profiling, doi:10.1130/0091-7613(1989)017<0505:MPBFOT>2.3.CO;2, Alabama stratigraphy: Alabama Geological Survey Circular, Geologic map of North America: Perspectives and explanation, Geological Society of America, Decade of North American Geology, Mechanics of Appalachian folding as illustrated by the Sequatchie anticline, Tennessee and Alabama, The American Association of Petroleum Geologists Bulletin, U-Pb, Rb-Sr, and K-Ar isotopic studies bearing on the development of the southernmost Appalachian orogen, Alabama [Ph.D. thesis], Origin and development of the Gulf of Mexico Basin, Alabama Geological Survey Special Map 168, Geology of the Pine Mountain Window and Adjacent Terranes in the Piedmont Province of Alabama and Georgia, Geological Society of America, Southeastern Section, Field Trip Guidebook, U-Pb zircon geochronology of Neoacadian and Early Alleghenian plutonic rocks in the Alabama Eastern Blue Ridge, Southern Appalachian Mountains, Tectonic evolution of the western part of the Pine Mountain window and adjacent Inner Piedmont province, Contrasts in Tectonic Style between the Inner Piedmont Terrane and the Pine Mountain Window: Alabama Geological Society 18th Annual Field Trip Guidebook, Character of the Alleghanian orogeny in the southern Appalachians: Part III, Regional tectonic relations, doi:10.1130/0016-7606(1986)97<1345:COTAOI>2.0.CO;2, U.S. Geological Survey and Society of Exploration Geophysicists, Kinematics of the Towaliga, Bartletts Ferry, and Goat Rock fault zones, Alabama: The late Paleozoic dextral shear system in the southernmost Appalachians, doi:10.1130/0091-7613(1988)016<0852:KOTTBF>2.3.CO;2, The Pine Mountain window of Alabama: Basement-cover evolution in the southernmost exposed Appalachians, Basement Tectonics 8: Characterization of Ancient and Mesozoic Continental Margins: Proceedings of the 8th International Conference on Basement Tectonics (Butte, Montana, 1988), Southernmost Appalachian terranes, Alabama and Georgia, Geology of the Alabama Inner Piedmont terrane, Geological Survey of Alabama Bulletin 139, Evidence for Alleghanian development of the Goat Rock fault zone, Alabama and southwest Georgia: Temporal compatibility with the master decollement, doi:10.1130/0091-7613(1992)020<0845:ADOTGR>2.3.CO;2, Geology of the Brevard zone in the hinge of the Tallassee synform, Alabama Fall Line: Implications for southernmost Appalachian tectonostratigraphy, New Perspectives on Southernmost Appalachian Terranes, Alabama and Georgia, Alabama Geological Society 43rd Annual Trip Guidebook, New isotopic dates on crystalline rocks from Alabama and Georgia, 2005, Southernmost Appalachian Terranes, Alabama and Georgia: Tuscaloosa, Alabama Geological Society, Southeastern Section of the Geological Society of America Field Trip Guidebook, Gondwanan/Peri-Gondwanan origin for the Uchee terrane, southernmost Appalachians, Alabama and Georgia: Zeroing in on sutures, Gondwanan/Peri-Gondwanan origin for the Uchee terrane, Alabama and Georgia: Carolina zone or Suwannee terrane(?)
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