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Lueders, Sea Fossil R.B.

Submitted by Raven Mueller on Tue, 2014-07-08 09:11
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Physical Data
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Flexural Strength, Wet (psi): 
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Specimen 2014-022
This specimen is a minimally fossiliferous limestone. The limestone is grain supported and has a predominantly micrite cement matrix. These criteria define the limestone as a packstoneAllochems comprise about 65 percent. Allochem composition is approximately 55 percent peloid, 25 percent bioclast, 15 percent ooid, and 5 percent intraclast. These estimates indicate this specimen is a sorted biopelmicrite. Identifiable bioclasts are mostly uniserial forminifera and highly rounded unidentified fragments. One well preserved univalve mollusk is preserved with a maximum dimension of .75 mm. Foraminifera have a maximum dimension of .4 mm. Unidentified rounded bioclast fragments have a maximum dimension of .8 mm, many with micritic envelopes. Peloids have a maximum dimension of .25 mm, a minimum of .08 mm, and a modal range around .15 mm. Ooids have a maximum dimension of .2 mm, a minimum of .08 and a modal range around .12 mm. Intraclasts have a maximum dimension of 1.35 mm. Collophane is very rare and has a maximum dimension of .6 mm. Calcispheres are also rare and have a maximum dimension around .12 mm. Iron hydroixdes form the core of some ooids and also is present in mouldic voids. This is visible in the hand specimen by a light yellowish color. Extant voids in the specimen are very rare and have vug morphology with a maximum dimension of .5 mm. There is some variation in the degree of sorting and allochem/intraclast composition across the slide. This reflects minimal sedimentary banding visible in the hand specimen. Compaction prior to lithification appears to be minimal.
MP 7/21/2015


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Specimen ID
2014-022 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
2014-022 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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