Welcome to the latest edition of the Accretionary Wedge geoblogging carnival. We’ve been delighted by the response to our call for your favourite geological imagery, and the number of nominations we’ve received has been matched by their diversity – images have ranged from the microscopic to continental scales, from the depths of geological time to the present day, from the igneous to the sedimentary. The only way we could think of to do this smorgasboard of earth science justice was in the form of a visual dictionary, matching the images you’ve provided to the feature or process that they exemplify. Clicking on each image will allow you to see it in all its full-resolution glory at the original post, which in many cases also provides some more background on the geological feature or process depicted. Fun, pretty and at least a little bit educational – we hope you’ll have as much fun looking through our little glossary as we had putting it together.
Photo: Arch, Arches National Park from Geotripper
Photo: Unknown beach with channel deposits. From Michael Welland.
Photo: Pyroclastic breccia, Eagle Mtns, west Texas. From geosciblog.
Photo: Monument Valley by Dino Jim.
Photo: Canyonlands National Park from Geology Happens
Photo: Ebb-tidal delta – eastern Brazil. From Geologia Marinha e Costeira.
Photo: Ogallala/Arikaree formation near the Pawnee Buttes in north eastern Colorado (conglomerate butte landscape) from Russ Dale
Photo: Debris flows, Pacific NW. From Anne Jefferson
Photo: Riviere de Terre – natural ‘artwork’ featuring dried, cracked clay. From Pools and Riffles.
Photo: pendant calcite crystals precipitated within meteoric aquifers during late Ordovician sea-level fall, Appalachians. From Suvrat.
Picture: Letchworth State Park in Castille, NY, painted by Levi Wells. From John van Hoesen.
Photo: Cerro Divisadero, Patagonia, from Brian Romans
– K/T (or K/Pg) boundary, 65 million years ago
– Permo-Triassic boundary, 250 million years ago.
Photo: Permo-Triassic transition, Dolomites, N Italy. From Nologic.
Photo: Kings Canyon National Park. From Helena Heilotrope
Photo: Lamurde Anticline, from Failed Rift.
Photo: ptygmatic folding in metagraywacke, from Callan Bentley.
Photo: overturned syncline at Dog Canyon, Big Bend National Park. From Antonio
Photo: Goosenecks, Utah. From Failed Rift.
Photo: the most epic rainstorm of Kyle House’s life.
Hematite – iron oxide (Fe2O3), a common product of weathering and other low temperature alteration.
Photo: Hematite sheets, Red River Gorge, Kentucky. From Stubotics
Jointing – rock fractures with no displacement across the fracture. Can be the result of regional stresses or cooling of volcanic rock.
Photo: Long’s Peak, from Pascal
Kyanite – an aluminum-rich silica mineral (Al2SiO5), commonly deep blue in color, that generally forms during high pressure metamorphism.
Photo: Metamorphic kyanite, Scotland. From Life-Long Scholar
Photo: Attabad landslide, Hunza, N. Pakistan from Dave’s Landslide Blog
Photo: Erta Ale, Afar, Ethiopia from Chris Rowan
Photo: North Caineville Mesa, just east of Capitol Reef National Park in southern Utah. From Jim Repka.
Photo: Ansel Adams, Winter Sunrise, Sierra Nevada. From Lockwood.
Ooids – round, concentrically layered sedimentary grains, usually of calcium carbonate.
Photo: Photomicrograph of ooids in a Jurassic carbonate, from Lost Geologist
Photo: Gold with naumannite (Ag2Se), Northern Nevada. From Silver Fox.
Photo: First colonisation of lava flow by plant from Magma Cum Laude.
Picture: model of mantle flow around subducting Alaskan slab, from Discovery News.
Photo: from Kyle House.
Seismic Reflection Survey – controlled release of sound waves to examine the subsurface structure of the Earth. Modern computer processing provides extremely high spatial resolution.
Photo: Buried paleo-channels in Gulf of Mexico. From Hindered Settling.
Photo: Seismograph for Mb 6.0 earthquake beneath the Kermadec Islands on Sept 21, 1981, recorded at Adelaide, Australia. From Hypocentre.
Photo: Tilted sandstones, Fountain Valley, Roxborough State Park near Denver, Colorado. From Russ Dale
Photo: twinned selenite (sparry gypsum), from Lutz.
Photo: Mt St Helens – volcano above a subduction zone. From Short Geologist.