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Lueders, Charcoal

Submitted by Raven Mueller on Tue, 2014-07-08 09:06
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Physical Data
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Flexural Strength, Wet (psi): 
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Specimen 2014-033
This specimen is a limestone with a very low fossil content. The limestone is not grain supported and has a micrite cement matrix with a patchy distribution of sparite. Allochems constitute between 50 to 30 percent of slide area. These criteria define the limestone as a wakestone. Variation in crystal size may indicate much of the cement matrix is altered by neomorphism. Allochem composition is about 80 peloid, 10 percent ooid, and 10 percent bioclast. These estimates and degree of sorting classify this limestone as a poorly washed pelsparite. Most bioclasts have micritic envelopes. Identifiable bioclasts are mostly foraminifera with a few identifiable brachiopods. Maximum foraminifera dimension is .6 mm and maximum brachiopod dimension is 1 mm. Peloids and the much less common ooids have similar size ranges with a maximum dimension of .5 mm, a minimum of .05, and a modal range around .25 to .4 mm. Peloid size ranges are commensurate with a faecal origin. Calcispheres are present in low quantities with a maximum dimension of .15 mm. Rare collophane fragments are present with a maximum dimension of 1 mm. Authigenic quartz is very rare and has a maximum dimension of .4 mm. Extant voids are essentially absent. A small amount of peloid and ooids, less than 5 percent, have iron hydroxide staining. Compaction is difficult to estimate, but could be fairly substantial prior to lithification. Macroscopically visible fossils are present in the hand specimen not seen in this slide.
MP 7/21/2015


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Specimen ID
2014-033 Image of specimen in dry conditions. Finish: download image Image of specimen in wet conditions. Finish: download image

Thin Sections

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Specimen ID Non-polarized Cross-polarized
2014-033 Specimen shown in non-polarized image Specimen shown in cross-polarized image


NOTE: Quarry locations are approximate.

Lueders Limestone Co. Quarry
14752 State Highway 6
79533 Lueders , Texas
United States
32° 47' 13.1352" N, 99° 35' 50.568" W
Texas US

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