Monthly Archives: July 2013

Literal GeoSign

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Lytton, BC is home to the only geosign I know of that is actually a sign made of geology. The jellyroll is a geologic structure made by a submarine slump. This monstrous example was uncovered at a local gravel mine, … Continue reading

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Geo’s Sign

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Today, I offer a geosign for the July Accretionary Wedge created by geoscientists and geographers: Geophysical surveys involve a lot of trying to figure out where you took measurements in relation to where you want data. In mountainous, forested, cloudy … Continue reading

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Cotton Creek Pass, Colorado

Ryan is currently biking across America, sending photo updates of his adventures. He’s sent back photos of an awesome natural rock wall in the Cotton Creek Pass on Colorado State Highway 125, Grand County, Colorado. This is a dyke structure, … Continue reading

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Carbonate Classification

Compare and contrast the carbonate classification schemes of Folk and Dunham. Carbonate rocks are composed of allochems and orthochems. Allochems are the outside components, effectively grains that are the equivalent of clasts in sandstones. Orthochems are the inside components, the … Continue reading

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GeoSigns: Tanzania

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Continuing my temporary obsession with using the July Accretionary Wedge to dig through my photo collection, the signs in Tanzania regularly made me burst out laughing. A few favourites: 1. Signs in the Wilderness Driving 6 hours from town to … Continue reading

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Permanent Guide

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I’m getting a bit carried away with the July Accretionary Wedge on geologic and geographic signs. When visiting tourist attractions, I take photographs of the signs to identify where the subsequent photos are from, and to capture the popularly-accepted geologic … Continue reading

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Iconography of Disaster

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The July Accretionary Wedge on geologic and geographic signs gave me the excuse to finally share my collection of warning signs. I have a soft spot for the iconography of disaster, and the difficulty of sharing vital information in a … Continue reading

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Sandstone Maturity

With reference to quartz arenites, feldspathic arenites and lithic arenites, explain what is meant by “sandstone maturity.” Mineralogy & Weathering Supracrustal rocks are those formed at the surface. Subcrustal rocks are those formed below the surface. Where minerals form impact … Continue reading

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Sedimentation Saturday: An Introduction

A Problem I’m usually a geophysicist, trying to figure out what’s down there while staying safely up there. For geophysicists, classification of rocks is by their physical properties. Is it conductive, resistive, magnetic, or opaque to all my methods? This … Continue reading

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August Accretionary Wedge

The Accretionary Wedge is an ongoing geoblogosphere carnival, a month of thematic posts on any topic that strikes the collective fancy. After watching geotweeps compliment a particular field guide, I ask: what do you think of the field guides for … Continue reading

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