National Register of Historic Places Eligibility Testing of Sites 41LT172 and 41LT354 in Luminant's Kosse Mine, Limestone, Texas Page: 16
This report is part of the collection entitled: Texas State Publications and was provided to The Portal to Texas History by the UNT Libraries Government Documents Department.
Extracted Text
The following text was automatically extracted from the image on this page using optical character recognition software:
4
METHODS
FIELD METHODS
A multiphase approach was utilized to determine the NRHP eligibility status of the tested sites
where the results of each phase were used to determine the necessity of subsequent phases.
Additional shovel testing, magnetometer survey, backhoe trenching, and hand unit excavation were
utilized at 41LT354. Only shovel testing and backhoe trenching were conducted at 41LT172.
Horizontal Control
A grid was established on both sites with a Total Station. All shovel tests, trenches and hand-
excavated units were tied to the grid with the Total Station.
Shovel Testing
Additional shovel testing was proposed for the historic component at site 41LT172 and subsite area
3 at site 41LT354. Shovel testing was conducted at 10-meter (m) grid intercepts at 41LT172 with
additional shovel tests conducted at 5-m grid intercepts in areas of high historic artifact density.
Shovel tests were conducted at 10-m grid intercepts along 20-m east-to-west transects at subsite
area 3 at 41LT354. Additional shovel tests were conducted at 10-m grid intercepts within high
artifact density and diversity areas at the site.
Magnetometer Survey
A magnetometer survey was conducted on subsite area 3 at site 41LT354. Past studies at
prehistoric sites in the Post Oak Savannah have demonstrated the effectiveness of using
magnetometers to locate hearth features (Rogers 1995a, 1995b, 1999, 2000; Sherman 1999;
Sherman et al. 2007). The technique constitutes an efficient, nondestructive method of locating
buried rock hearth features, as the rocks within the hearths retain a remnant magnetization from
the heating process. When a material containing magnetite (for example hearth rocks or clay) is
heated, especially past the Curie point, many of the magnetic domains within the material realign,
orienting themselves with magnetic north. In a magnetometer survey, this heated material (from
hearths; pottery, bricks, kilns, etc.) will stand out against the surrounding unheated material whose
magnetic domains are randomly oriented (Breiner 1999:46).Private and Confidential
Atkins 100021558/110187 16
Upcoming Pages
Here’s what’s next.
Search Inside
This report can be searched. Note: Results may vary based on the legibility of text within the document.
Tools / Downloads
Get a copy of this page or view the extracted text.
Citing and Sharing
Basic information for referencing this web page. We also provide extended guidance on usage rights, references, copying or embedding.
Reference the current page of this Report.
Atkins North America, Inc. National Register of Historic Places Eligibility Testing of Sites 41LT172 and 41LT354 in Luminant's Kosse Mine, Limestone, Texas, report, February 2012; Austin, Texas. (https://texashistory.unt.edu/ark:/67531/metapth839205/m1/25/: accessed April 28, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.