Paleoenvironmental records spanning more than 30,000 years are used to reconstruct an overview of... more Paleoenvironmental records spanning more than 30,000 years are used to reconstruct an overview of vegetational changes occurring in Texas during the late-Quaternary. Primary emphasis is devoted to reconstructions based on published and unpublished palynologi-cal data. Those records are supplemented, where appropriate, by supporting information gained from geological, archaeological, paleontological. and non-palynological botanical sources. Briefly, the combined record indicates that elements of the northern and southeastern United States flora, including Picea glauca, invaded regions of east and central Texas during the late-Quaternary period and remained part of the regional vegetation until late-glacial times. Although vast regions of west Texas were probably covered by conifer forests during the full-glacial period, those forests were not as widespread as some earlier reports have indicated. The area of south Texas revealed that a mosaic vegetational pattern probably was well established throughout the post-glacial period and perhaps even longer. And, it appears that regions of north Texas contained grassland savannas during the post-glacial and part of the late-glacial period.
The detailed analysis of human coprolites as a recognized field of archaeological science is bare... more The detailed analysis of human coprolites as a recognized field of archaeological science is barely 40 years old. Dr. Eric O. Callen, the founder and developer of the discipline, has been dead for more than 30 years, yet the ideas he developed and techniques he perfected continue to guide the discipline today as it widens analysis into more areas than he ever dreamed possible. Callen would be gratified to learn that others have extended his initial research efforts to include the routine analysis of plant macrofossils, pollen concentration values, fauna and insects, phytoliths, and more recently, immunological proteins, trace elements, gas chromatography, and the extraction and identification of DNA from prehistoric human feces.
Investigates the use of pollen as trace evidence in criminal cases where forensic evidence plays ... more Investigates the use of pollen as trace evidence in criminal cases where forensic evidence plays an important role in the investigation.
Paleoenvironmental records spanning more than 30,000 years are used to reconstruct an overview of... more Paleoenvironmental records spanning more than 30,000 years are used to reconstruct an overview of vegetational changes occurring in Texas during the late-Quaternary. Primary emphasis is devoted to reconstructions based on published and unpublished palynologi-cal data. Those records are supplemented, where appropriate, by supporting information gained from geological, archaeological, paleontological. and non-palynological botanical sources. Briefly, the combined record indicates that elements of the northern and southeastern United States flora, including Picea glauca, invaded regions of east and central Texas during the late-Quaternary period and remained part of the regional vegetation until late-glacial times. Although vast regions of west Texas were probably covered by conifer forests during the full-glacial period, those forests were not as widespread as some earlier reports have indicated. The area of south Texas revealed that a mosaic vegetational pattern probably was well established throughout the post-glacial period and perhaps even longer. And, it appears that regions of north Texas contained grassland savannas during the post-glacial and part of the late-glacial period.
The detailed analysis of human coprolites as a recognized field of archaeological science is bare... more The detailed analysis of human coprolites as a recognized field of archaeological science is barely 40 years old. Dr. Eric O. Callen, the founder and developer of the discipline, has been dead for more than 30 years, yet the ideas he developed and techniques he perfected continue to guide the discipline today as it widens analysis into more areas than he ever dreamed possible. Callen would be gratified to learn that others have extended his initial research efforts to include the routine analysis of plant macrofossils, pollen concentration values, fauna and insects, phytoliths, and more recently, immunological proteins, trace elements, gas chromatography, and the extraction and identification of DNA from prehistoric human feces.
Investigates the use of pollen as trace evidence in criminal cases where forensic evidence plays ... more Investigates the use of pollen as trace evidence in criminal cases where forensic evidence plays an important role in the investigation.
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