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Lueders, Carmel

Submitted by Raven Mueller on Tue, 2014-07-08 08:42
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Specimen: 2014-015-1
This specimen is a minimally fossiliferous limestone. The limestone is not grain supported and has a predominantly micrite cement matrix. Allochems comprise approximately 15 to 20 percent of slide area. These criteria best define the limestone as a wackestone. Patchy distributions in grain size may indicate some neomorphism has occurred and rare Euhedral rhombs of carbonate may indicate some dolomitization. This slide is unstained, so dolomite and calcite cannot be easily distinguished. Allochem composition is near 100 percent biolcast. There is some indication that peloids and other forms may have contributed to the cement matrix but are no longer easily discernable. The present allochem composition estimate and degree of sorting characterize the limestone as a sparse biomicrite. Identifiable bioclasts are predominantly foraminifera. Elongate fragments probably corresponding to bivavles, given the lack of preserved shell mineral structure (as opposed to brachiopods), are also present. Many bioclasts have micritic envelopes. Maximum bivalve fragment dimension is 1.4 by .15 mm (not measuring sinuosity). A modal range is around .75 to 1 mm in length and .2 to .1 mm in width. The modal range for foraminifera is .25 to .35 mm. There are a few isotropic inclusions likely of biogenic origins that have altered to collophane. The largest of these is .65 by .15 mm. Staining from iron hydroxides (limonite) is fairly common and imparts a yellow-orange color to the hand sample. Extant voids appear to be nearly absent, but there are many created in the sample preparation process. This may suggest poor consolidation or perhaps a water soluble component. Degree of compaction is difficult to estimate in this slide.
MP 7/21/2015


Thin Sections

Click thumbnail for larger image.
Specimen ID Non-polarized Cross-polarized
2014-015-1 Specimen shown in non-polarized image Specimen shown in cross-polarized image
2014-015-2 No image available.
2014-015-3 No image available.
2014-015-4 No image available.


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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