New Omomyid Primates (Haplorhini, Tarsiiformes) from Middle Eocene Rocks of West-Central Hot Springs County, Wyoming

1979 ◽  
Vol 31 (1-2) ◽  
pp. 48-73 ◽  
Author(s):  
Thomas M. Bown
Keyword(s):  
Hot Springs ◽  
Middle Eocene ◽  
West Central

New marine ostracod species from the Middle Eocene of west-central Sinai, Egypt

2016 ◽  
Vol 117 ◽  
pp. 150-159 ◽  
Author(s):  
Abdel-Mohsen M. Morsi ◽  
Abdel-Galil A. Hewaidy ◽  
Ahmed Samir
Keyword(s):  
Middle Eocene ◽  
West Central ◽  
Ostracod Species

Geothermal gradients in the Hinton area of west-central Alberta

1982 ◽  
Vol 19 (4) ◽  
pp. 755-766 ◽  
Author(s):  
H. L. Lam ◽  
F. W. Jones ◽  
C. Lambert
Keyword(s):  
Hot Springs ◽  
Rocky Mountain ◽  
Geothermal Gradient ◽  
Temperature Data ◽  
Petroleum Exploration ◽  
Well Logs ◽  
Thermal Gradients ◽  
Disturbed Region ◽  
West Central ◽  
Exploration Well

Temperature data from petroleum exploration well logs of 3360 wells in a region of west-central Alberta are used to estimate thermal gradients. A relatively high geothermal gradient (~36 °C/km) of oblong shape located near Hinton is observed. The axis of the anomaly strikes approximately southwest–northeast and passes through the Miette Hot Springs area. It appears that water is heated at depth in the Rocky Mountain disturbed region and travels eastward and toward the surface along fault planes.

Quantitative Middle Eocene benthic foraminiferal biofacies from west-central Sinai, Egypt: Implications to paleobathymetry and sequence stratigraphy

2020 ◽  
Vol 155 ◽  
pp. 101823 ◽  
Author(s):  
Sherif Farouk ◽  
Sreepat Jain ◽  
Nancy Belal ◽  
Mohamed Omran ◽  
Khaled Al-Kahtany
Keyword(s):  
Sequence Stratigraphy ◽  
Middle Eocene ◽  
West Central

The 6 November 1774 MI 6 Bolaños Graben Earthquake (Southern Basin and Range Province, West-Central Mexico): Macroseismic Observations and Neotectonic Implications

2020 ◽  
Vol 91 (5) ◽  
pp. 2473-2486 ◽  
Author(s):  
Max Suter
Keyword(s):  
Hot Springs ◽  
Basin And Range ◽  
Alluvial Fan ◽  
Central Mexico ◽  
Western Boundary ◽  
Basin And Range Province ◽  
Active Deformation ◽  
Ground Shaking ◽  
Southern Basin ◽  
West Central

Abstract The continental part of west-central Mexico is characterized by the active extensional tectonic regimes of the Trans-Mexican volcanic belt and the adjacent southern Basin and Range Province. The deformation of the latter is distributed over several topographically very pronounced grabens and half-grabens (width 10–20 km, length ≤200  km; throw 1–2 km), including the Aguascalientes, Juchipila, Tlaltenango, and Bolaños grabens. Here, an A.D. 1774–1775 earthquake series in that area is documented based on numerous contemporary sources. The 6 November 1774 mainshock caused moderate-to-severe damage in several communities of the Bolaños graben, including the silver mining town of Bolaños, and moderate damage to communities in the Tlaltenango graben, such as the administrative center of Colotlán. Based on the macroseismic intensity distribution, the epicenter was in the Bolaños graben. The preferred magnitude of the mainshock is ∼6.0±0.5. No major historical earthquake had been reported previously from this region. Existing ground-shaking hazard models may, therefore, give a false sense of security. In the Bolaños graben, motion along the graben-bounding faults and the observed tilting of the graben shoulders has to be mostly younger than the 19.9 Ma age of the youngest basalt of the graben-shoulder stratigraphy. Its correlation across the western master fault indicates a 1300 m throw and a vertical long-term slip rate of 0.07  mm/yr. The observations of alluvial fan deposits juxtaposed against the footwall ignimbrites along the western master fault of the Bolaños graben, the displacement of alluvial fan deposits along secondary faults within the graben, and the existence of hot springs along the western boundary fault all are indicative of active deformation, and so is evidently the A.D. 1774 earthquake.

Catastrophic death assemblage of Chelomophrynus bayi (Anura, Rhinophrynidae) from the Middle Eocene Wagon Bed Formation of central Wyoming

1993 ◽  
Vol 67 (6) ◽  
pp. 1016-1026 ◽  
Author(s):  
Amy C. Henrici ◽  
Anthony R. Fiorillo
Keyword(s):  
Young Adults ◽  
Calcium Carbonate ◽  
Hot Springs ◽  
Middle Eocene ◽  
Bedding Plane ◽  
Preferred Orientation ◽  
Time Averaging ◽  
Body Parts ◽  
Bone Modification ◽  
Representative Area

A unique monospecific bonebed of rhinophrynid anurans was recently discovered in the Wagon Bed Formation (Middle Eocene, Uintan), Hot Springs County, Wyoming. The bonebed occurs on a single bedding plane within a thin sandstone layer. This unit is part of a nearshore facies of a calcium carbonate-rich lake in which the water was warm, shallow, and quiet at the site of the mortality layer.A representative area of this bonebed, approximately 450 square centimeters in size, provides the basis for this taphonomic and paleoecologic study. This area contains approximately 600 bones and at least 19 individuals are represented. Skeletons are nearly completely disarticulated but somewhat associated, bone modification features are absent, a slight preferred orientation of the linear bones is present, and many of the lighter, less dense skeletal elements are underrepresented. Scavengers probably contributed to disarticulation of the skeletons. Bone depletion occurred by a combination of the action of scavengers, weak currents, and the sloughing off of body parts as the carcasses floated. The assemblage was not subjected to extensive winnowing by currents.All of the specimens within this assemblage represent young adults. Because the frogs are all of the same ontogenetic age and the deposit shows no signs of time averaging, the assemblage is interpreted as the result of catastrophic death, possibly by disease, of one age class. Either a population of frogs inhabited the site where the mortality layer formed or the carcasses floated into it.

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