#brecciation

[greenhubscitech]

Meteorite may represent 'bulk background' of Mars' battered crust http://goo.gl/GCOjj5 - SciTech News - #comet, #planetary, #spaceexploration, #spacemission

http://scitechnews.co.uk/space-exploration/meteorite-may-represent-bulk-background-of-mars-battered-crust/

Meteorite may represent 'bulk background' of Mars' battered crust

NWA 7034, a meteorite found a few years ago in the Moroccan desert, is like no other rock ever found on Earth.

It’s been shown to be a 4.4 billion-year-old chunk of the Martian crust, and according to a new analysis, rocks just like it may cover vast swaths of Mars.

View Original Article

#comet, #planetary, #spaceexploration, #spacemission

[asfaltics]

folding, faulting, and brecciation, 2

detail (minus border rule, etc) of Plate xxiv, Jaspilite from Grand Rapids Mine, Negaunee illustrating Charles Richard Van Hise (1857-1918 *) and William Shirley Bayley (1861-1943). The Marquette iron-bearing district of Michigan, with atlas. Including a chapter on the Republic Trough, by Henry Lloyd Smith. Department of the Interior. Monographs of the U.S. Geological Survey. XXVIII. 1897. * The "two emphatic intrusions" found in the monochrome Google scan (of copy at Stanford University) were evidently a tear in the, or loose scrap of, paper. This poor snapshot of an original copy (at Harvard's Cabot Science Library) can only hint at the beauty — uniformly so — of the plates in this volume. The two presentations are incomparable and striking in their respective ways.

Google scans of copies at Cornell* and Purdue* are also available. The Stanford and Cornell scans are at least partly in color (but no color for Plate xxiv); the Purdue scan misses Plate xxiv.