My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
2018-01-03_PERMIT FILE - C1981010 (8)
DRMS
>
Day Forward
>
Permit File
>
Coal
>
C1981010
>
2018-01-03_PERMIT FILE - C1981010 (8)
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
3/2/2018 9:38:25 AM
Creation date
3/2/2018 9:22:23 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981010
IBM Index Class Name
Permit File
Doc Date
1/3/2018
Doc Name
Test Excavation of Site 5MF7762 by Grand River Institute BLM LSFO No. 11.2.2016
Section_Exhibit Name
Appendix K Part K-XVI
Media Type
D
Archive
No
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
69
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
prolonged rework and transport. Many Mesozoic orthoquartzites exhibit authigenic chalcedony <br />filling interstices and voids, and quartz grains and silica cement have been altered to high <br />refractive quartz by a combination of heat and pressure in diagenesis. Light-colored <br />orthoquartzites are described as "salt and pepper" with black chert grains being the "pepper." <br />Sucrosic is another term applied to these rocks, describing reflected light from facets on <br />fractured quartz and other mineral grains. <br />Most of these rocks have distinct characters useful in identification. Dakota Formation <br />(Cretaceous) is commonly light colored, typically "salt and pepper" and sucrosic; related Burro <br />Canyon Formation (Jurassic -Cretaceous) orthoquartzite is variegated, ranging from tan to <br />cream to red and green. Also, Burro Canyon Formation green porcellanite was used as tool <br />stone in many areas, and tools of this material have been observed throughout the region. <br />Cloverly Formation (Cretaceous) is chiefly identified by quartz overgrowths on clastic grains <br />and even colors, ranging from gray to tan to red to purple. Morrison Formation (Jurassic) <br />porcellanite contains fossil roots and rhizomes, and f ecoids (worm burrows) associated to a <br />fossil soil, and mottling related to exsolution of iron oxy-hydroxides. <br />Obsidian is commonly called volcanic glass because it is found in "obsidian flows" <br />within the margins of rhyolitic lava flows. The obsidian flows are a phenomenon where felsic <br />lava extruded from a volcano cools rapidly with minimum crystal growth, a result of the <br />presence of a high silica content which induces a high viscosity and polymerization degree to <br />the lava. This material is a hard and brittle substance that fractures with very sharp edges, and <br />was used by Native Americans primarily as cutting tools and projectile points. Because it is <br />volcanic, it has a particular chemical signature that can be identified by its source; hence the <br />term "sourcing" of obsidian. Obsidian is found on many sites in the region and is derived from <br />sources primarily found in Idaho, Wyoming, New Mexico, and Utah. <br />10.3 Groundstone Analysis <br />The in -field collections of suspected groundstone included 31 items that were selected <br />for cleaning and analysis by Holly Shelton. The laboratory assessments were aided by <br />Groundstone Analysis, A Technical Approach by Jenny Adams (2002). After cleaning, the <br />groundstone artifacts consist of 6 mano fragments, 16 apparent metate fragments, and a piece <br />of a comal. Importantly, six of the metate fragments when combined to measure 16 x 14 x <br />3.2cm and were identified as part of a unifacially pecked and ground, shallow basin metate. <br />One other artifact of interest was a thin groundstone fragment (14.4 x 9.6 x 1.6cm), with a <br />smoothed edge that may have functioned as a comal. The remaining artifacts include a mano <br />that exhibits use -wear as a hide processor, a small polishing stone, 2 apparent chopper <br />31 <br />
The URL can be used to link to this page
Your browser does not support the video tag.