Geology of the Comstock-Indian Wells area, Val Verde, Terrell, and Brewster Counties, Texas

Freeman, Val L.

doi:10.3133/pp594k

Cited by 14 publications

(3 citation statements)

References 3 publications

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“…The orientation of the features identifi ed in the site walkover and the aerial photo analysis matched the orientation of the many large paleokarst collapse features identifi ed by Freeman ( 1968 ) a few kilometers south of the site (Fig. 15.9 ).…”

Section: Inventory Of Karst Featuresmentioning

confidence: 85%

Site Walkover

Benson¹,

Yuhr²

2016

Site Characterization in Karst and Pseudokarst Terraines

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While a site visit may have taken place during the contracting phase of work, these are rapid tours of a site with little time to stop and observe or take detailed notes. The site walkover is when we get our fi rst chance to make good observations and an initial assessment of general site conditions. It provides an opportunity to evaluate and expand our preliminary understanding of site conditions obtained from the desk study and the review of aerial photos. This initial effort should allow adequate time for the site to be covered. The observations made and information gathered from a site walkover should include geologic and hydrologic observations, inventory of karst features, indications of subsidence or sinkhole activity as well as an assessment of cultural features that may impact access, safety or a particular method of measurement used on site.While the site walkover has many objectives, it should progress from a reconnaissance overview to obtain fi rst impressions and then begin to gradually focus upon the sitespecifi c details. On-site observations must not be limited to a single site walkover, but as the fi eld effort proceeds, additional site walkovers and observations should be incorporated throughout the site characterization process.

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Section: Inventory Of Karst Featuresmentioning

confidence: 85%

Site Walkover

Benson¹,

Yuhr²

2016

Site Characterization in Karst and Pseudokarst Terraines

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“…In southwest Texas, Freeman ( 1968 ) had observed indications of elongated collapse ranging in width from a couple of meters wide and several meters long to as much as 450 m wide and almost 5 km long. These features were for the most part aligned in a northeast direction and many had angular branching suggesting a relation to joint sets.…”

Section: Southwest Texasmentioning

confidence: 97%

The Desk Study

Benson¹,

Yuhr²

2016

Site Characterization in Karst and Pseudokarst Terraines

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The desk study is where a basic understanding of the site is developed. We also begin to identify what we know and do not know about the site along with a preliminary conceptual model for the site. The desk study includes the acquisition of relevant existing data that covers the regional setting, its geology and geomorphology (the sites geologic history) as well as local and possibly site-specifi c conditions. During the desk study, reconnaissance aerial photos, topographic and geologic maps should be obtained to provide an overview of the site and surrounding area. Information should be gathered and mined from a variety of sources including government agencies, sinkhole, cave and well databases, site-specifi c reports and even anecdotal information. This information and data is then used to develop the preliminary conceptual model of site conditions.

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“…Amblycheila katzi is currently known only from western Texas in the Trans-Pecos region of the Chihuahuan Desert. All known occurrences are from steep-sided canyons in Val Verde and Terrell Counties, where natural or man-made forces have exposed bedrock, primarily Cretaceous limestone (Freeman 1968) (Fig. 3A).…”

Section: Taxonomymentioning

confidence: 99%