10. Our results from comparing regional geophysical data with the surface and subsurface geology indicate clear demarcation of Laurentian crust in roughly the northwestern half of Alabama, and peri-Gondwanan or Gondwanan crust underlying the southeastern quarter. Political Parties, Interest Groups & Movements, Civil Rights & Modern Georgia, Since 1945, Georgia Partnership for Excellence in Education, Hargrett Rare Book and Manuscript Library. During our analysis of the aeromagnetic and gravity data, we consulted the aeroradioactivity map, where coverage was available, and found it to correspond closely to the surface geology depicted on the state geologic map (Szabo et al., 1988). ADD magnetic and gravity signatures are truncated by the east-west–trending Altamaha magnetic low associated with the Suwannee suture. High-frequency, curved and linear magnetic highs represent amphibolites of Dadeville Complex (Ropes Creek Amphibolite; Bentley and Neathery, 1970; Osborne et al., 1988) as well as local ultramafic bodies; broad low-frequency anomalies are felsic metaplutonic and metavolcanic units (Camp Hill Gneiss, Rock Mills Granite Gneiss, Chattasofka Creek Gneiss, and Waverly Gneiss; Bentley and Neathery, 1970; Osborne et al., 1988; Raymond et al., 1988; Neilson and Bittner, 1990; Neilson et al., 1997; Steltenpohl et al., 1990; Drummond et al., 1997). The Hillabee Greenstone, mostly a massive greenstone, appears to be non-magnetic. The Jacksons Gap Group on the west limb is in fault contact with the overlying Dadeville Complex (Inner Piedmont) and the underlying Emuckfaw Group of the eastern Blue Ridge. Such analysis is beyond the scope of this study. In the New Madrid region, the earthquakes dramatically affected the landscape. Along the southern boundary of the ADD, there is a gradual, though distinct, west-to-east decrease in the angle of discordance such that south of domain 35 (Fig. East-northeast–trending linear anomalies marking an unnamed splay of the Towaliga fault (Sears et al., 1981; Steltenpohl, 1992). Across the central and eastern United States, it is rare for rivers to flow north because the slope of the land is toward the south and east. On the other hand, Alaska, Oklahoma and California register the most earthquakes in a given year, according to the USGS. The high-angle discordance between strike of the northeast-trending Appalachians and the generally east-west–trending Coastal Plain onlap is one of the more prominent features on the geological map of North America (Reed et al., 2005), and nowhere is this difference more pronounced than in Alabama (Fig. If you are viewing the PDF of this paper or reading it offline, please visit, General geology of the crystalline rocks of Alabama, U-Pb ages of metarhyolites of the Catoctin and Mount Rogers Formations, central and southern Appalachians: Evidence for two pulses of Iapetan rifting, Structural evolution and metamorphic petrogenesis of a metasediments and metaigneous complex, Coosa County, Alabama [PhD dissertation], Preliminary report on buried pre-Mesozoic rocks in Florida and adjacent areas, Gravity and magnetic modeling of basement beneath Alabama Gulf Coastal Plain [M.S. The long-wavelength (low-frequency) magnetic pattern resembles that of the nearby older Elkahatchee pluton (feature 21) directly to the east. Rivers flow in one direction all over the world, and that direction is downhill. New digital map images combine contours, shaded relief, and color to accentuate regional patterns of highs and lows, gradients, and lineaments simultaneously. In Alabama, the Suwannee terrane contains felsic volcanic rocks intruded by granodiorite that are overlain by Lower Ordovician through Devonian sedimentary rocks containing Gondwanan faunal assemblages (Applin, 1951; Barnett, 1975; Neathery and Thomas, 1975; Pojeta et al., 1976; Chowns and Williams, 1983; Guthrie and Raymond, 1992; Mueller et al., 1994, 1996). The main Towaliga fault marks the boundary between the Opelika Complex (Inner Piedmont) and the Pine Mountain basement-cover massif (Sears et al., 1981; Steltenpohl, 1988). Distinct high-frequency magnetic highs of mylonitized peri-Gondwanan Carolina/Uchee crust are distinguished from broad, flat lows of Laurentian Pine Mountain crust along the Central Piedmont suture. The NY-AL lineament is clearly expressed in Alabama (lineament 3 in Fig. 2 for location). 2; Russell, 1978; Stoddard, 1983; Bieler and Deininger, 1987; Grimes et al., 1997; Drummond et al., 1997; Steltenpohl, 2005). The Inner Piedmont of Alabama has been subdivided into the Dadeville and Opelika Complexes (Bentley and Neathery, 1970; Neathery and Tull, 1975; Osborne et al., 1988). 15. The largest Georgia one ever recorded happened in 1916. 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. This domain corresponds to Paleozoic granitic plutons of the eastern Blue Ridge (Kowaliga Gneiss and Zana Granite) and the Opelika Complex (Bottle Granite and Farmville Metagranite; Bentley and Neathery, 1970; Neathery and Tull, 1975; Osborne et al., 1988; Steltenpohl et al., 1990, 2005a, 2005b). Although Georgia has seen a few EF-4 tornadoes, with the most recent one on April 27, 2011 in Catoosa County, the state has never recorded an EF-5 tornado. Question: Which City Has The Largest Population Density? Aeromagnetic anomalies record upper-crustal structure down to the Curie isotherm (25–30 km) for induced magnetization of the buried rocks. 3). normal-slip faults. This feature is delineated on the magnetic map by contrasting broad flat magnetic lows of the Pine Mountain basement granites to the northwest and the strong, high-frequency magnetic highs of mylonites and mylonitized amphibolites and dioritic gneisses of the Uchee terrane to the southeast (domain 35, below). The discovery in the late 1950s of Lower Ordovician through Devonian sedimentary rocks containing Gondwanan faunal assemblages from exploration wells penetrating the pre-Jurassic basement (here meaning either or both Gondwanan and crystalline Appalachian basement) beneath Gulf Coastal Plain sedimentary rocks in south Alabama (Applin, 1951) was a critical piece of the puzzle that Wilson needed to help solidify his thoughts on cycles of ocean basins opening and closing and continents colliding. Table 1 provides an abbreviated guide to aid in relating these features to Figures 3, 4, and 5 and an interpretation of each feature. Northeastern part of domain 4, having relatively high, 880–1600 nT relief. Toward the east and south, high-angle discordance between the northeast-trending Appalachians and the east-west–trending wedge of overlapping Mesozoic and Cenozoic Gulf Coastal Plain sediments reveals how bedrock geophysical signatures progressively change with deeper burial. This could explain the macro-scale ductile thinning of the Hillabee Greenstone depicted in this general area on the Alabama state geologic map (Osborne et al., 1988). In their interpretation, the N15°E-trending magnetic low labeled 4C in Figure 3 roughly corresponds to the severed and displaced Grenville front; the subparallel low directly to the east, combined features 9 and 17B, was similarly interpreted to be the southern continuation of the Amish anomaly, a belt of relatively non-magnetic metasedimentary rocks bored in West Virginia and thought to represent an intra-Grenville suture zone (Culotta et al., 1990; King et al., 1998). Two complete Wilson cycles and the beginning of a third are recorded in the lithosphere of southeastern North America (Hatcher, 1978, 1987, 2004, 2010; Thomas, 2006) (Fig. In Georgia, tornadoes are often hard to see as they are wrapped in areas of rain and hail. Each of these geologic provinces is truncated at the surface in western and south-central Alabama by the Cretaceous to Holocene sedimentary rocks of the Gulf Coastal Plain. The Grenville front records the final phase of assembly of the supercontinent Rodinia, and we interpret it to be related to the N15°E-trending magnetic low in northwest Alabama (feature 4C in Fig. The "Fabulous" Fox Theatre, an awe-inspiring brick... A number of significant historical events have occurred in... LaTour, Timothy E. "Blue Ridge Geologic Province." Timing of thrusting in the southern Appalachians, USA: Model for orogeny? 25. 17B. A small earthquake nearby will feel like a small sharp jolt followed by a few stronger sharp shakes that pass quickly. 2) and its immediate country rocks (feature 21 in Figs. Whereas relief on the basement could be the cause of some magnetic anomalies, no rationale was found to identify such anomalies. 4. The Goodwater-Enitachopco fault (Neathery and Reynolds, 1973; Tull, 1978; McConnell and Costello, 1980; Raymond et al., 1988; Tull and Holm, 2005) has cut the frontal edge of the eastern Blue Ridge thrust sheet, leaving two “marooned” structural salients that are partitioned by the Millerville reentrant and contain correlative sequences of migmatitic Ashland Supergroup (i.e., northern salient is Mad Indian above Poe Bridge Mountain Groups, and southern salient is Hatchet Creek above Higgins Ferry Groups; Fig.

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