Submitted by Raven Mueller on Thu, 2014-07-10 09:11
Trade Name Alias: 
Stone Type (Commercial): 

A light beige limestone with inclusions and shells that take a good polish.

Physical Data
Munsell Color(s): 
Absorption (%): 
Density (lb/cf): 
Flexural Strength, Dry (psi): 
Modulus of Rupture, Dry (psi): 
Compressive Strength, Dry (psi): 
Bulk Specific Gravity: 
Abrasion Resistance: 
Stone Type (Lithologic): 
Grain Shape: 
Grain Sorting: 
Grain Size: 
Petrographic Description: 

Specimen: 2014-036
This specimen is a minimally fossiliferous limestone that has undergone significant diagenetic change. The limestone was originally a predominantly micritic cement matrix with an allochem composition of 20 percent or higher that does not appear grain supported. This estimation would identify the limestone as a wackestone. The limestone is porous with observable extant voids 3.75 mm in the maximum dimension. Presently voids constitute less than 3 percent of slide area. This porosity permitted the growth of substantial secondary calcite in channels and vugs. Filled channels present in the slide have a maximum width of 3 mm and extend beyond slide boundaries. These are filled with carbonate grains up to 2.6 mm in size with consertal and straight boundaries. Patchy distributions in grain size also suggest neomorphism in the finer grained matrix. Currently perceptible allochem composition is essentially 100 percent bioclast, other forms may have originally been present. Bioclasts are mostly skeletal grains of likely bivalves and brachiopods. Distinctive primary growth calcite growth patterns identify Compostia sp. as one genus present and place the age of the limestone likely in the Permian. Bioclasts have a maximum dimension of 3 mm. The limestone is best classified presently as a sparse biomicrite. Spherulitic quartz nodules, likely secondary chalcedony, are rarely present and have a maximum dimension of .3 mm. Fossils and carbonate veins are visible in the hand sample. Given the porosity of the slide it seems likely lithification occurred prior to significant compaction.
MP 7/21/2015

Specimen: 2014-063
This specimen is a fossiliferous limestone. The limestone is not grain supported and has a predominantly micrite cement matrix although sparite is locally abundant, typically as an infilling in remnant structures. Allochems comprise about 10 to 20 percent of non-void slide area. These criteria define the limestone as a wackestone. Identifiable allochem composition is near 100 percent bioclast. This estimate and the degree of sorting classify the limestone as a sparse biomicrite. Remnant structures, largely resulting from selective dissolution, suggest peloids contributed substantially to the volume of the matrix but cannot now be discriminated from micrite cement. Bioclasts, although individually rare, tend to be fairly large. Most fossils are clearly bilateral shells. Brachiopod species seem the most likely as indicated by some remnant shell structures, but most fossils have undergone substantial secondary replacement. Rare echinoderm fragments are also present. Maximum fossil dimension is 7.5 mm. Larger examples are visible in the hand specimen. Opaque minerals, likely oxy-hydroxides are very rare and constitute less than 1 percent of slide area. Authigenic quartz is also extremely rare and usually fibrous in habit. Patches of consertal sparite with individual crystals up to 1 mm fill what are likely primary voids and replace fossils. Secondary voids, resulting from the selective dissolution of micrite structures, are locally common and constitute about 5 to 10 percent of total slide area. These voids are most likely a recent phenomenon indicative of near surface weathering.
MP 9/4/2014


Click thumbnail for larger image.
Specimen ID
2014-036 Image of specimen in dry conditions. Finish: download image Image of specimen in wet conditions. Finish: download image
2014-063 Image of specimen in dry conditions. Finish: download image Image of specimen in wet conditions. Finish: download image

Thin Sections

Click thumbnail for larger image.
Specimen ID Non-polarized Cross-polarized
2014-036 Specimen shown in non-polarized image Specimen shown in cross-polarized image
2014-063 Specimen shown in non-polarized image Specimen shown in cross-polarized image


NOTE: Quarry locations are approximate.

TexaStone Quarries
1400 Sherrod Rd
79739 Garden City , Texas
United States
31° 58' 56.2008" N, 101° 26' 25.44" W
Texas US

Report an Issue

Type the words or phrase shown below to verify that you are not a robot.