Texas Cordova Cream

Submitted by Raven Mueller on Thu, 2014-07-10 09:42
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Stone Type (Commercial): 
Physical Data
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Specimen: 2014-045
This is a fossiliferous limestone. The limestone is grain supported with a sparite cement matrix, much of it from syntaxial overgrowth. Allochems constitute about 90 percent of slide area. These criteria define the limestone as a grainstone. Allochem composition is about 60 percent ooid, 20 percent bioclast, and 20 percent peloid. These estimates and the degree of sorting indicate this limestone is a rounded oosparite. Echinoderm are the most common fossil and have a maximum dimension of about .35 mm, bivalve and brachiopods are difficult to distinguish and have a combined maximum dimension of .8 mm and a modal range closer to .3 mm. Brachiopods and bivalve fossils have micritic envelopes. Ooids and peloids have similar size distributions with a maximum around .3 mm, a minimum of .04, and a modal range around .1 to .2 mm. Interparticle and intraparticle extant voids are relatively common with a combined slide area around 3 percent. Intraparticle voids form mainly as halos around the micritic rinds of ooids, these eventually lead to the liberation of the grain and interparticle void formation. Maximum interparticle void dimensions are around .3 mm. These voids are discernable in the hand sample by its sandpaper feel. The rinds of ooids are generally porous as indicated by the prevalence of the blue stained impregnating material. There is a perceptible preferred orientation to both ooid/peloid elongation and brachiopod/bivalve fossils. Macroscopic banding is also visible in the hand sample. Given the preservation of allochems, lithification likely occurred prior to compaction.


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Specimen ID
2014-045 Image of specimen in dry conditions. Finish: download image Image of specimen in wet conditions. Finish: download image Close-up image of specimen in wet conditions. Finish: download image
2014-045-2 No image available.

Thin Sections

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Specimen ID Non-polarized Cross-polarized
2014-045 Specimen shown in non-polarized image Specimen shown in cross-polarized image
2014-045-2 No image available.


NOTE: Quarry locations are approximate.

Armadillo Quarry
Liberty Hill , Texas
United States
30° 37' 9.606" N, 98° 0' 38.124" W
Texas US

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