Return to: Field Observations and Some Experimental Results | Discussion

Figure 5.3A. (Top) Blackened lithoclasts in karst solution pit breccia in cross-bedded eolian grainstone approximately 20 m above sealevel. Eolian host rock is late Pleistocene and has never been submerged. Note fractures in black pebble, indicating fracturing took place after emplacement in breccia. Length of key 6 cm. 5.3B. (Middle) Thin section of contact between oolitic black pebble and reddish-brown eolian grain stone to left. Blackening of the oolitic grainstone pebble is due to blackening of individual ooid grains. Cement is clear blocky calcite spar of vadose origin. 5.3C. (Bottom) Another pebble from the same exposure showing contact between blackened soilstone crust pebble at right and reddish-brown carbonate grainstone (highly altered by soil processes) to left. Scale bar 400 µm.

Return to: Field Observations and Some Experimental Results | Discussion

U.S. Department of the Interior, U.S. Geological Survey
This page is: http://sofia.er.usgs.gov/publications/papers/blackened_limestone/figure5.3.html
Comments and suggestions? Contact: Heather Henkel - Webmaster
Last updated: 09 December, 2004 @ 01:38 PM(TJE)