BETA

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Top Ledge Cottonwood

Submitted by Raven Mueller on Thu, 2014-07-10 09:22
Trade Name Alias: 
Stone Type (Commercial): 
Availability: 
Available
Physical Data
Color: 
Munsell Color(s): 
Absorption (%): 
3.93
Density (lb/cf): 
146.44
Modulus of Rupture, Dry (psi): 
947
Compressive Strength, Dry (psi): 
6,832
Bulk Specific Gravity: 
2.35
Abrasion Resistance: 
8.20
Geology
Stone Type (Lithologic): 
Chronostratigraphy: 
Grain Shape: 
Subrounded
Rounded
Grain Sorting: 
Moderately-Sorted
Grain Size: 
Coarse
Medium
Petrographic Description: 

Specimen: 2014-039-1

This is a fossiliferous limestone. The limestone is not grain supported and has a near uniformly micrite cement matrix. Allochems constitute about 40 percent of slide area. These characteristics classify the limestone as a wackestone. Allochems are essentially 100 percent bioclasts. This percentage and degree of sorting indicate that this limestone is classified as a sparse biomicrite. Bioclasts are nearly all a singular genus of planispiral foraminifera (<95 percent), rarely other bioclasts including bryozoans, brachiopods, enchinoderms, and bivalves are present. Foraminifera fossils have a maximum dimension of 3.5 mm. Micritic envelopes are readily visible on foraminifera but often absent on other fossil types. Secondary, mostly cryptocrystalline quartz, is present but occupies far less than 1 percent of slide area. Extant voids are rare at around 1 percent of slide area. Most extant voids seem to form in association with the dissolution of fossils. Iron hydroxide and hematite staining is also present in small patches that constitute less than 1 percent of slide area. Fossils foraminifera are readily visible in the hand sample. Lithification appears to have occurred prior to significant compaction.
MP 7/21/2015

See also Susan Ward Aber and David A. Grisafe, "Petrographic Characteristics of Kansas Building Limestones," Kansas Geological Survey Bulletin 224 ([Lawrence, KS], 1982), available online at http://www.kgs.ku.edu/Publications/Bulletins/224/

Images

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Specimen ID
2014-039-1 Image of specimen in dry conditions. Finish: download image Close-up image of specimen in dry conditions. Finish: download image Image of specimen in wet conditions. Finish: download image Close-up image of specimen in wet conditions. Finish: download image
2014-039-2 No image available.

Thin Sections

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Specimen ID Non-polarized Cross-polarized
2014-039-1 Specimen shown in non-polarized light.download image Specimen shown in cross-polarized light.download image
2014-039-2 No image available.

Quarry

NOTE: Quarry locations are approximate.

Cottonwood Quarry
Cottonwood Falls , Kansas
United States
38° 21' 14.0904" N, 96° 28' 22.8" W
Kansas US

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