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Lueders, Sea Fossil

Submitted by Raven Mueller on Tue, 2014-07-08 09:07
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Specimen: 2014-021
This specimen is a minimally fossiliferous limestone. The limestone is grain supported and has a predominantly micrite cement matrix, but sparite locally dominates. These criteria define the limestone as a packstone, but other samples could feasibly appear as grainstones. Allochems comprise about 70 percent of slide area. Allochem composition is about 45 peloid, 40 percent ooid, and 15 percent bioclast. These estimates indicate this specimen is a rounded oosparite. Identifiable bioclasts are predominantly micritic walled foraminifera, mostly uniserial and have a maximum dimension of about .6 mm. Other less well preserved bioclasts may also be present. Other oblong forms with micritic envelopes are likely fossils that have been completely replaced by sparite and are too indistinct for identification. These have micritic envelopes and a maximum dimension of .85 mm. Calcispheres are also present with a modal size around .15 mm. Peloids have a maximum dimension of about .7 mm, a minimum of .08 mm and a modal range around .2 mm. Ooids have a maximum dimension of about .3 mm, a minimum of .08, and a modal range around .15 mm. Most of the ooids have very thin micritic walls and many appear to have a calcisphere or other fossiliferous nuclei. This limestone could arguably be classified as a rounded biosparite instead of oosparite depending on how these grains are counted. Opaque minerals make up far less than 1 percent of slide area and have a maximum dimension of .06 mm. Extant voids of any kind are essentially absent in this specimen. Overall the specimen appears minimally to moderately compacted prior to lithification.
MP 7/21/2015


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Specimen ID
2014-021 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
2014-021 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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