Fig. 5 in A. Baucon, Studi Trent. Sci. Nat., Acta Geol., 83, 15 (2008): Selection of body fossils from the Musaeum Metallicum. a. Aldrovandi describes this specimen as a “Rock pregnant with a shell”. b. Aldrovandi describes such fossils as “Astroitis”, referring to the star-like morphology of certain echinoderms and corals. (via Storia della Geologia)
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Fig. 5 in A. Baucon, Studi Trent. Sci. Nat., Acta Geol., 83, 15 (2008): Selection of body fossils from the Musaeum Metallicum. a. Aldrovandi describes this specimen as a “Rock pregnant with a shell”. b. Aldrovandi describes such fossils as “Astroitis”, referring to the star-like morphology of certain echinoderms and corals. (via Storia della Geologia)

Fuente: mtsn.tn.it

Fig. 1 in P. Hammer et al., GSA Today, 21, 6 (2011): Location of transcontinental corridor (yellow lines) on a simplified tectonic age map of northern North America. Tectonic age is defined as the time since the most recent episode of tectonic deformation. Red arrows show along-strike offsets linking profile segments. The interpreted cross section incorporates Earth curvature and is displayed using a vertical exaggeration of 2:1. At this scale, features are difficult to identify; see 1:1 version extended to full lithospheric depth.
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Fig. 1 in P. Hammer et al., GSA Today, 21, 6 (2011): Location of transcontinental corridor (yellow lines) on a simplified tectonic age map of northern North America. Tectonic age is defined as the time since the most recent episode of tectonic deformation. Red arrows show along-strike offsets linking profile segments. The interpreted cross section incorporates Earth curvature and is displayed using a vertical exaggeration of 2:1. At this scale, features are difficult to identify; see 1:1 version extended to full lithospheric depth.

Fuente: geosociety.org

September GSA Today cover photo: National Elevation Dataset shaded relief image of Minnesota, USA, by Paul Morin of the University of Minnesota’s Polar Geospatial Center, showing the Lake Agassiz basin (NW), an ice stream path (SW), gullies along the Mississippi (SE), and Archean terrane (NE).
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September GSA Today cover photo: National Elevation Dataset shaded relief image of Minnesota, USA, by Paul Morin of the University of Minnesota’s Polar Geospatial Center, showing the Lake Agassiz basin (NW), an ice stream path (SW), gullies along the Mississippi (SE), and Archean terrane (NE).

Fuente: geosociety.org

September Nature Geoscience cover photo: Stretching of the continental crust can double its surface area, but it is unknown whether similar amounts of extension occur at depth. Seismic results from the central Basin and Range province, western USA, reveal a thick root of lithospheric mantle that has not been extended and indicates that crustal stretching is decoupled from extension at depth. The image shows badlands in Death Valley, California. See “Differential motion between upper crust and lithospheric mantle in the central Basin and Range”, by Schulte-Pelkum et al., p. 619-6326. Photo by Ian Parker.
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September Nature Geoscience cover photo: Stretching of the continental crust can double its surface area, but it is unknown whether similar amounts of extension occur at depth. Seismic results from the central Basin and Range province, western USA, reveal a thick root of lithospheric mantle that has not been extended and indicates that crustal stretching is decoupled from extension at depth. The image shows badlands in Death Valley, California. See “Differential motion between upper crust and lithospheric mantle in the central Basin and Range”, by Schulte-Pelkum et al., p. 619-6326. Photo by Ian Parker.

Fuente: nature.com

August GSA Today cover photo: The Three Sisters are iconic sandstone towers exposed above the Jamison Valley in the Blue Mountains, Australia. Erosion in the mountains is dominated by stream channels cutting through exposed joints and preferential erosion of weaker shale units interbedded within the Triassic-aged sandstone. See “Understanding Earth’s eroding surface with 10Be”, by Portenga & Bierman, p. 4–10. Photo by Eric Portenga.
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August GSA Today cover photo: The Three Sisters are iconic sandstone towers exposed above the Jamison Valley in the Blue Mountains, Australia. Erosion in the mountains is dominated by stream channels cutting through exposed joints and preferential erosion of weaker shale units interbedded within the Triassic-aged sandstone. See “Understanding Earth’s eroding surface with 10Be”, by Portenga & Bierman, p. 4–10. Photo by Eric Portenga.

Fuente: geosociety.org

July’s Nature Geoscience cover photo: The southern San Andreas fault terminates in a stepover zone — several small faults that separate major fault segments — beneath the Salton Sea. Analysis of movements on the stepover zone faults indicates that periodic flooding of the palaeo-Salton Sea during the late Holocene could have triggered earthquakes on the San Andreas fault. The image shows a large obsidian boulder that rests on the slope of Red Hill at the southeast edge of the Salton Sea, California, USA. The salt-encrusted shoreline of the Salton Sea is visible in the distance. See “Loading of the San Andreas fault by flood-induced rupture of faults beneath the Salton Sea”, by Brothers et al., p. 486-492. Photo by Jenny E. Ross.
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July’s Nature Geoscience cover photo: The southern San Andreas fault terminates in a stepover zone — several small faults that separate major fault segments — beneath the Salton Sea. Analysis of movements on the stepover zone faults indicates that periodic flooding of the palaeo-Salton Sea during the late Holocene could have triggered earthquakes on the San Andreas fault. The image shows a large obsidian boulder that rests on the slope of Red Hill at the southeast edge of the Salton Sea, California, USA. The salt-encrusted shoreline of the Salton Sea is visible in the distance. See “Loading of the San Andreas fault by flood-induced rupture of faults beneath the Salton Sea”, by Brothers et al., p. 486-492. Photo by Jenny E. Ross.

Fuente: nature.com

July’s GSA Today cover photo: Clinker-capped terraces and buttes in the Eocene Wasatch Formation of the central Powder River Basin, with foothills and high peaks of the Bighorn Mountains in the western distance. Clinker in these exposures formed by shallow exhumation and natural coal burning between ~40 and 200 ka. See “Clinker geochronology, the first glacial maximum, and landscape evolution in the northern Rockies”, by Reiners et al., p. 4–9. Photo by Pete Reiners.
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July’s GSA Today cover photo: Clinker-capped terraces and buttes in the Eocene Wasatch Formation of the central Powder River Basin, with foothills and high peaks of the Bighorn Mountains in the western distance. Clinker in these exposures formed by shallow exhumation and natural coal burning between ~40 and 200 ka. See “Clinker geochronology, the first glacial maximum, and landscape evolution in the northern Rockies”, by Reiners et al., p. 4–9. Photo by Pete Reiners.

Fuente: geosociety.org

This month’s Geology cover photo: Infaunal molt pattern generated by the trilobite Paciphacops argentinus Tomas, 1906, late Silurian, from the Los Espejos Formation, Argentine Precordillera, San Juan Province, Argentina. See “Infaunal molting in Trilobita and escalatory responses against predation,” by Rustán et al., p. 495–498. Photo by: Emilio N. Vaccari.
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This month’s Geology cover photo: Infaunal molt pattern generated by the trilobite Paciphacops argentinus Tomas, 1906, late Silurian, from the Los Espejos Formation, Argentine Precordillera, San Juan Province, Argentina. See “Infaunal molting in Trilobita and escalatory responses against predation,” by Rustán et al., p. 495–498. Photo by: Emilio N. Vaccari.

Fuente: geology.gsapubs.org

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