Lueders, Light Antique

Submitted by Raven Mueller on Tue, 2014-07-08 08:54
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Specimen: 2014-018

This specimen is a fossiliferous limestone. The limestone is not grain supported, micrite predominates but sparite is also a significant component of the cement matrix. Allochems comprise about 30 to 40 percent of the slide area. These criteria define the limestone as a wackestone. Neomorphism may account for some of the variance in cement matrix grain size. Allochems are composed of approximately equal parts bioclast and peloid. This classifies this limestone as a sparse biopelmicrite. Peloid maximum dimension is .9 mm and minimum is .15. The modal range is around .3 mm. Peloids may actually contribute significantly more to slide area but are sufficiently deteriorated and deformed that they are indistinguishable from micrite cement. Bioclasts include foraminifera, mollusks, ostracods, and likely others. Mollusk bivalve fragments have a maximum dimension of 1.5 mm. Complete ostracods have a modal size range around .7 mm. Monocrystalline grains of calcite with sieve texture may, in some cases, may represent echinoderm parts. Porosity in this limestone is minimal with vug voids occupying far less than 1 percent of slide area. Deformation of peloid allochems suggests moderate compaction prior to lithification. Inclusions of collophane, likely indicative of bone and other organic fragments are present but rare. These have a maximum dimension of .5 mm. Iron hydroxide (limonite) staining is present in patches and is responsible for the yellowish hue of the rock. Extant voids are far less than 1 percent of slide area and mostly vug like with a maximum dimension near 1 mm.
MP 7/21/2015


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Specimen ID
2014-018 Image of specimen in dry conditions. Finish: Split-faceddownload image Image of specimen in wet conditions. Finish: Split-faceddownload image

Thin Sections

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Specimen ID Non-polarized Cross-polarized
2014-018 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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