Updated Articles and Resources
- Earth Science Week - A Special Week for EarthCreated: 2008-10-05 @ 00:24:36 GMT
Six months away from Earth Day is a whole week for Earth science: Earth Science Week… - Aftershocks Are Not AfterthoughtsUpdated: 2008-10-04 @ 23:37:35 GMT
Aftershocks can be nasty surprises, even worse than the main event… - Pictures of Geologic Features and ProcessesUpdated: 2008-10-04 @ 05:01:17 GMT
Pictures of geologic features and the processes of geology… - ConcretionsCreated: 2008-10-04 @ 05:00:22 GMT
shale bed ron schott iron compounds creative commons license sedimentary rocks: Small concretions in a Kansas shale… - Sedimentary Rock Gallery - Limestone BrecciaUpdated: 2008-10-04 @ 04:02:20 GMT
A breccia boulder made of gray limestone… - Sedimentary Rock Gallery - Conglomerate, Tumey Hills, CaliforniaUpdated: 2008-10-04 @ 04:02:20 GMT
A spectacularly diverse conglomerate from the Tumey Hills in the Coast Range… - Sedimentary Rock Gallery - ConglomerateUpdated: 2008-10-04 @ 04:02:19 GMT
Hand specimen of conglomerate… - Sedimentary Rock Gallery - Massive Sandstone in OutcropUpdated: 2008-10-04 @ 04:02:19 GMT
Sandstone in an Oakland quarry wall… - Sedimentary Rock Gallery - Conglomerate BoulderUpdated: 2008-10-04 @ 04:02:19 GMT
A conglomerate boulder in a Nevada wash… - Sedimentary Rock Gallery - ArkoseUpdated: 2008-10-04 @ 04:02:18 GMT
Arkose in the gallery of sedimentary rocks… - Sedimentary Rock Gallery - Bituminous CoalUpdated: 2008-10-04 @ 04:02:18 GMT
Bituminous coal in the gallery of sedimentary rocks… - Sedimentary Rock Gallery - DolomiteUpdated: 2008-10-04 @ 04:02:17 GMT
Dolomite in the gallery of sedimentary rocks… - Sedimentary Rock Gallery - Anthracite CoalUpdated: 2008-10-04 @ 04:02:17 GMT
Anthracite coal from a Welsh mine… - Sedimentary Rock Gallery - Fault BrecciaUpdated: 2008-10-04 @ 04:02:17 GMT
A brecciated cherty mudstone… - Sedimentary Rock Gallery - Pebble ConglomerateUpdated: 2008-10-04 @ 04:02:16 GMT
Pebble conglomerate from south of Fort Ross, California… - Sedimentary Rock Gallery - Banded Iron FormationUpdated: 2008-10-04 @ 04:02:16 GMT
Banded iron formation, in the gallery of sedimentary rocks… - Sedimentary Rock Gallery - PeatUpdated: 2008-10-04 @ 04:02:15 GMT
Florida peat, from the gallery of sedimentary rocks… - Sedimentary Rock Gallery - SiltstoneUpdated: 2008-10-04 @ 04:02:15 GMT
Siltstone, in the gallery of sedimentary rocks… - Sedimentary Rock Gallery - TurbiditesUpdated: 2008-10-04 @ 04:02:14 GMT
Turbidite sequences crop out in a roadcut… - Sedimentary Rock Gallery - CoquinaUpdated: 2008-10-04 @ 04:02:14 GMT
Coquina is a conglomerate made of shell fragments… - Sedimentary Rock Gallery - Franciscan Conglomerate, Jenner, Californ…Updated: 2008-10-04 @ 04:02:14 GMT
Franciscan conglomerate, from the gallery of sedimentary rocks… - Sedimentary Rock Gallery - Graywacke OutcropUpdated: 2008-10-04 @ 04:02:13 GMT
Graywacke in outcrop can be massive and resistant… - Sedimentary Rock Gallery - Sandstone, PleistoceneUpdated: 2008-10-04 @ 04:02:13 GMT
Young sandstone crops out along the ancestral Tuolumne River in the Sierra foothills… - Sedimentary Rock Gallery - Great Valley GraywackeUpdated: 2008-10-04 @ 04:02:12 GMT
Graywacke from the Great Valley Formation… - Sedimentary Rock Gallery - Conglomerate, Peachtree ValleyUpdated: 2008-10-04 @ 04:02:12 GMT
A tough conglomerate near the San Andreas fault… - Sedimentary Rock Gallery - ShaleUpdated: 2008-10-04 @ 04:02:12 GMT
Young shale at Ocean Beach, San Francisco… - Sedimentary Rock Gallery - Chert Nodule ExteriorUpdated: 2008-10-04 @ 04:02:11 GMT
Exterior of a chert nodule found in the Mojave Desert… - Sedimentary Rock Gallery - Conglomerate, Griswold CanyonUpdated: 2008-10-04 @ 04:02:11 GMT
Conglomerate of indistinct sandstone cobbles, Griswold Canyon, Diablo Range… - Sedimentary Rock Gallery - Chert Nodule InteriorUpdated: 2008-10-04 @ 04:02:11 GMT
Interior of a chert nodule… - Sedimentary Rock Gallery - Red ChertUpdated: 2008-10-04 @ 04:02:10 GMT
Red chert from the Franciscan's Novato Quarry Terrane… - Sedimentary Rock Gallery - Radiolarian ChertUpdated: 2008-10-04 @ 04:02:10 GMT
Classic radiolarian chert from Conzelman Road in the Marin Headlands… - Sedimentary Rock Gallery - GraywackeUpdated: 2008-10-04 @ 04:02:10 GMT
Graywacke from San Francisco's Baker Beach… - Sedimentary Rock Gallery - LimestoneUpdated: 2008-10-04 @ 04:02:09 GMT
Hand specimen of fine-grained limestone… - Sedimentary Rock Gallery - Shale, CretaceousUpdated: 2008-10-04 @ 04:01:08 GMT
Shale of the Great Valley Formation… - Sedimentary Rock GalleryUpdated: 2008-10-04 @ 04:01:08 GMT
An assortment of different sedimentary rocks… - Sedimentary Rock GalleryUpdated: 2008-10-04 @ 04:01:07 GMT
An assortment of different sedimentary rocks… - Sedimentary Rock GalleryUpdated: 2008-10-04 @ 04:01:06 GMT
An assortment of different sedimentary rocks… - Chlorite - Picture of the Mineral ChloriteUpdated: 2008-10-02 @ 04:02:14 GMT
alteration product mohs hardness grade rocks mineral chlorite: Shiny chlorite specimen from Vermont… - Geologic Tools of the TradeUpdated: 2008-09-30 @ 18:25:43 GMT
The humble tools adapted from tradesmen's equipment, plus the artist's eye and sketchpad, have served geologists well for centuries… - Seismic Hazard Zones, San Francisco, 2700x3600Updated: 2008-09-30 @ 00:55:44 GMT
Large map showing areas prone to liquefaction and landsliding, San Francisco area, from California Department of Conservation Division of Mines and Geology… - Seismic Hazard Zones, San FranciscoUpdated: 2008-09-30 @ 00:55:43 GMT
Map showing areas prone to liquefaction and landsliding, San Francisco area, from California Department of Conservation Division of Mines and Geology… - Six Things to Know About the Earth's MantleUpdated: 2008-09-29 @ 23:59:56 GMT
A look at six different aspects of the Earth's mantle… - The Global Seismic Hazard Map - World Map of Earthquake HazardCreated: 2008-09-29 @ 23:45:31 GMT
The first map to show the entire world's seismic hazard consistently is all here on this site… - Granite Picture Gallery - Hand Specimen of Salinian GraniteUpdated: 2008-09-28 @ 00:23:28 GMT
Hand specimen of granite from the Salinian block, California… - Granite Picture Gallery - Peninsular Ranges Granite 2Updated: 2008-09-28 @ 00:23:28 GMT
Granite of the Peninsular Ranges Batholith, southern California… - Granite Picture Gallery - Granite of the Sierra Nevada Batholith at …Updated: 2008-09-28 @ 00:23:28 GMT
Granite of the Sierra Nevada Batholith at Donner Pass… - Granite Picture Gallery - Blocks of GraniteUpdated: 2008-09-28 @ 00:23:27 GMT
Granite characteristically weathers in large blocks… - Granite Picture Gallery - Sierra Nevada GraniteUpdated: 2008-09-28 @ 00:23:27 GMT
Granite of the Sierra Nevada, California… - Granite Gallery - Salinian Granite near King CityUpdated: 2008-09-28 @ 00:22:25 GMT
Granite of the Salinian block near King City, California… - Granite Gallery - Fayalite Granite of Pikes Peak, ColoradoUpdated: 2008-09-28 @ 00:22:24 GMT
Pink granite from the top of Pikes Peak, Colorado… - Granite Picture Gallery - Peninsular Ranges Granite 1Updated: 2008-09-28 @ 00:22:24 GMT
Granite from the Peninsular Range of southern California… - Granite Picture Gallery - Sierra Nevada Garnet-Hornblende Granite Cl…Updated: 2008-09-28 @ 00:22:24 GMT
Garnet and hornblende punctuate this Sierra Nevada granite… - Granite GalleryUpdated: 2008-09-28 @ 00:22:23 GMT
Pictures of various granites and granitic rocks… - Granite GalleryUpdated: 2008-09-28 @ 00:22:23 GMT
Pictures of various granites and granitic rocks… - Granite GalleryUpdated: 2008-09-28 @ 00:22:23 GMT
Pictures of various granites and granitic rocks… - About Igneous RocksUpdated: 2008-09-28 @ 00:10:15 GMT
The three great rock classes--igneous, sedimentary and metamorphic--are introduced with igneous rocks. … - Joshua Tree National Park: GraniteUpdated: 2008-09-28 @ 00:07:17 GMT
Closeup of a typical granite outcrop in Joshua Tree National Park… - What Is Commercial Granite?Updated: 2008-09-28 @ 00:04:29 GMT
The granites of geology and commerce are quite different… - Granitoids - Granite and the Related Rocks Granodiorite, Diorite and…Updated: 2008-09-27 @ 23:54:54 GMT
How geologists sort out granite from the rocks that look like it… - About QuartzUpdated: 2008-09-27 @ 23:53:09 GMT
quartz grains sio 2 conchoidal fracture quartz sand: Quartz alone and in rocks, with some notes… - Mineral Habits - Massive HabitUpdated: 2008-09-26 @ 23:41:37 GMT
Quartz shows a massive habit in this gneiss… - Mineral Habits - Micaceous HabitUpdated: 2008-09-26 @ 23:41:37 GMT
Micaceous habit is exemplified here not by mica but by asbestos… - Mineral Habits - Lamellar HabitUpdated: 2008-09-26 @ 23:41:36 GMT
Thick gypsum chunks show a lamellar habit… - Mineral Habits - GeodeUpdated: 2008-09-26 @ 23:41:36 GMT
Calcite crust is the most common lining of geodes… - Mineral Habits - Granular HabitUpdated: 2008-09-26 @ 23:41:36 GMT
The granular habit involves poorly formed crystals, unlike the equant habit… - Mineral Habits - Encrusting HabitUpdated: 2008-09-26 @ 23:41:35 GMT
Calcite on a limestone overhang shows an encrusting habit… - Mineral Habits - Equant HabitUpdated: 2008-09-26 @ 23:41:35 GMT
The equant habit is more or less round… - Mineral Habits - Fibrous HabitUpdated: 2008-09-26 @ 23:41:35 GMT
Rutile takes a fibrous form in quartz… - Mineral Habits - Acicular HabitUpdated: 2008-09-26 @ 23:41:34 GMT
Acicular minerals take needlelike forms… - Mineral Habits - Bladed HabitUpdated: 2008-09-26 @ 23:40:36 GMT
Kyanite exemplifies the bladed mineral habit… - Mineral Habits - Drusy HabitUpdated: 2008-09-26 @ 23:40:36 GMT
Drusy minerals form crystalline crusts… - Mineral Habits - Botryoidal HabitUpdated: 2008-09-26 @ 23:40:35 GMT
Botryoidal mineral tend to look like grape clusters… - Mineral Habits - Cruciform HabitUpdated: 2008-09-26 @ 23:40:35 GMT
Cruciform minerals commonly occur in crossed twins… - Mineral Habits - Dendritic HabitUpdated: 2008-09-26 @ 23:40:35 GMT
Copper metal displays a branching dendritic habit… - Mineral Habits - Amygdaloidal HabitUpdated: 2008-09-26 @ 23:40:34 GMT
Amydaloidal minerals form in amygdules… - Mineral Habits - Banded HabitUpdated: 2008-09-26 @ 23:40:34 GMT
Banded minerals tend to form layers… - Mineral Habits - Blocky HabitUpdated: 2008-09-26 @ 23:40:34 GMT
Pyrite grains display a blocky habit… - Mineral Habits - Reniform HabitUpdated: 2008-09-26 @ 23:40:33 GMT
Hematite shows the reniform habit… - Mineral Habits - Rhombohedral HabitUpdated: 2008-09-26 @ 23:40:33 GMT
Calcite forms rhombohedral grains… - Mineral Habits - Rosette HabitUpdated: 2008-09-26 @ 23:40:33 GMT
Barite commonly displays a rosette habit… - Mineral Habits - Radiating HabitUpdated: 2008-09-26 @ 23:40:32 GMT
A pyrite dollar shows radiating habit… - Mineral Habits - Platy HabitUpdated: 2008-09-26 @ 23:40:32 GMT
Gypsum has a platy habit in this clear pane… - Mineral Habits - Prismatic HabitUpdated: 2008-09-26 @ 23:40:32 GMT
Prismatic habit is usually shown by tourmaline… - Mineral HabitsUpdated: 2008-09-26 @ 23:40:31 GMT
The various forms that minerals take in rocks… - Mineral HabitsUpdated: 2008-09-26 @ 23:40:31 GMT
The various forms that minerals take in rocks… - Mineral HabitsUpdated: 2008-09-26 @ 23:40:30 GMT
The various forms that minerals take in rocks… - Kyanite - Picture of KyaniteCreated: 2008-09-26 @ 23:23:45 GMT
A specimen of the important indicator mineral kyanite… - Mineral Picture GalleryUpdated: 2008-09-26 @ 23:23:45 GMT
The mineral wing of the About Geology Picture Gallery… - About Geology - Geology BasicsUpdated: 2008-09-26 @ 15:30:14 GMT
Whatever your interest is in geology, here's where to start learning about it… - About the Crust of the EarthUpdated: 2008-09-25 @ 22:36:47 GMT
The Earth's crust is exceptionally important, and not just because we live on it… - What Is Geology?Updated: 2008-09-25 @ 21:20:48 GMT
The whole of Earth sciences, compressed to a nutshell… - Labradorite - Plagioclase FeldsparUpdated: 2008-09-24 @ 23:25:20 GMT
The labradorite variety of plagioclase feldspar exhibits a brilliant blue play of color… - Potassium or Alkali Feldspar - Microcline (Amazonite)Updated: 2008-09-24 @ 23:23:10 GMT
Bright-green amazonite is an easy-to-recognize variety of microcline, a potassium or alkali feldspar… - Plagioclase FeldsparUpdated: 2008-09-24 @ 23:18:58 GMT
Plagioclase feldspar is a major rock-forming mineral… - Gallery of Feldspars - Alkali Feldspar of Pikes PeakUpdated: 2008-09-24 @ 23:15:34 GMT
Pink alkali feldspar is the predominant ingredient of Pikes Peak's granite… - Gallery of Feldspars - Polished LabradoriteUpdated: 2008-09-24 @ 23:15:34 GMT
A polished labradorite specimen shows its gaudy side… - Gallery of Feldspars - Plagioclase Feldspar in AnorthositeUpdated: 2008-09-24 @ 23:15:34 GMT
Anorthosite hand specimens from New York's Adirondack Mountains… - Gallery of Feldspars - Labradorite, UnpolishedUpdated: 2008-09-24 @ 23:15:33 GMT
Labradorescence shows even in an unpolished specimen… - Gallery of Feldspars - Potassium Feldspar GrainsUpdated: 2008-09-24 @ 23:15:33 GMT
Large grains of alkali feldspar in a stone park bench… - Gallery of Feldspars - Potassium Feldspar CrystalUpdated: 2008-09-24 @ 23:15:33 GMT
A large grain of alkali feldspar shows its two cleavages… - Gallery of Feldspars - Potassium Feldspar in AndesiteUpdated: 2008-09-24 @ 23:15:32 GMT
Andesite of the Sutter Buttes is full of large sanidine grains… - Gallery of Feldspars - Plagioclase in AnorthositeUpdated: 2008-09-24 @ 23:14:30 GMT
Plagioclase is well displayed in a gravestone… - Gallery of FeldsparsUpdated: 2008-09-24 @ 23:14:29 GMT
Picture gallery of the feldspar minerals… - Gallery of FeldsparsUpdated: 2008-09-24 @ 23:14:29 GMT
Picture gallery of the feldspar minerals… - Gallery of FeldsparsUpdated: 2008-09-24 @ 23:14:29 GMT
Picture gallery of the feldspar minerals… - About Feldspar - Telling Apart the Feldspar MineralsCreated: 2008-09-24 @ 22:22:33 GMT
Feldspar is the commonest mineral in the Earth's crust, but identifying it can be tricky… - About Geothermal EnergyUpdated: 2008-09-24 @ 18:25:04 GMT
Geothermal energy exploits the Earth's heat budget… - About Geology -- The Complete Guide to GeologyUpdated: 2008-09-20 @ 03:46:54 GMT
About Geology includes everything from outer space to the Earth's core, from the oldest fossils to the landslides and earthquakes of today… - Geology Wallpaper Images - Rock CloseupsUpdated: 2008-09-15 @ 02:42:52 GMT
A selection of wallpaper images of rocks in loving detail… - Geology Wallpaper - Rock Closeups - Anorthosite Slab, 1600x1200Created: 2008-09-15 @ 02:41:52 GMT
Anorthosite slab, 1600x1200, from the Rock Closeups collection of geologic wallpaper images on About.com… - Geology Wallpaper - Rock Closeups - Anorthosite Slab, 1280x1024Created: 2008-09-15 @ 02:41:52 GMT
Anorthosite slab, 1280x1024, from the Rock Closeups collection of geologic wallpaper images on About.com… - Quakes and Other Events - Geological PhenomenaUpdated: 2008-09-13 @ 22:33:11 GMT
Geological events like earthquakes and volcanic eruptions are always newsworthy… - Explore GeologyUpdated: 2008-09-13 @ 22:27:51 GMT
Get involved more deeply and personally in geology-related activities… - Granite - Picture of GraniteUpdated: 2008-09-13 @ 22:09:50 GMT
Picture of a salt-and-pepper granite specimen from central California… - QAP Diagram for Plutonic Rocks - Igneous Rock Classification DiagramsUpdated: 2008-09-12 @ 00:57:47 GMT
QAP ternary diagram showing IUGS classification of phaneritic igneous rocks… - QAP Diagram for Volcanic Rocks - Igneous Rock Classification DiagramsUpdated: 2008-09-12 @ 00:57:47 GMT
Ternary diagram showing IUGS classification of volcanic rocks… - TAS Diagram for Volcanic Rocks - Igneous Rock Classification DiagramsUpdated: 2008-09-12 @ 00:57:47 GMT
Total-alkali-silica diagram for IUGS classification of aphanitic igneous rocks… - Igneous Rock Classification DiagramsUpdated: 2008-09-12 @ 00:57:46 GMT
Diagrams showing IUGS classification of phaneritic and aphanitic igneous rocks… - Igneous Rock Classification DiagramsUpdated: 2008-09-12 @ 00:57:46 GMT
Diagrams showing IUGS classification of phaneritic and aphanitic igneous rocks… - Igneous Rock Classification DiagramsUpdated: 2008-09-12 @ 00:57:46 GMT
Diagrams showing IUGS classification of phaneritic and aphanitic igneous rocks… - Phaneritic Igneous Rock ClassificationUpdated: 2008-09-09 @ 03:58:27 GMT
Simplified Q-A-P ternary diagrams showing IUGS classification of phaneritic igneous rocks… - Granite - All About Granite Rock and Granite GeologyUpdated: 2008-09-08 @ 22:42:24 GMT
Granite is the signature rock of the continents…