Geologic Map Database of Texas

Stoeser, Douglas B.; Shock, Nancy; Green, Gregory N.; Dumonceaux, Gayle M.; Heran, William D.

doi:10.3133/ds170

Cited by 16 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The phylogenetic topology is also congruent with the added detail provided by studies of the upper Medina River near the Knippa Gap (Clark & Journey, 2006; Doyle, 2003). The Pleistocene Leona Formation (Stoeser et al., 2006) further reveals ancestral river courses (Clark et al., 2013; Hill & Vaughan, 1898) that correspond to the Pleistocene distribution and phylogenetic diversification of E. lepidum revealed in this study (Figure 2a, d).…”

Section: Discussionsupporting

confidence: 66%

Integrative ichthyological species delimitation in the Greenthroat Darter complex (Percidae: Etheostomatinae)

et al. 2021

View full text Add to dashboard Cite

Species delimitation is fundamental to deciphering the mechanisms that generate and maintain biodiversity. Alpha taxonomy historically relied on expert knowledge to describe new species using phenotypic and biogeographic evidence, which has the appearance of investigator subjectivity. In contrast, DNA‐based methods using the multispecies coalescent model (MSC) promise a more objective approach to describing biodiversity. However, recent criticisms suggest that under some conditions the MSC may over‐split lineages, identifying species that do not reflect biological reality. Here, we reconcile these approaches using empirical data for the Greenthroat Darter complex (Etheostoma lepidum), a small freshwater fish species with a disjunct distribution in Texas and New Mexico, USA. We demonstrate that MSC methods recognizes all nine sampled populations as distinct species, sometimes splitting specimens from a single locality into multiple species. However, environmental, phenotypic, and biogeographic evidence do not corroborate the nine species supported by the MSC. Instead, collective evidence indicates that E. lepidum is comprised of just three species that are consistent with the molecular phylogeny: Etheostoma lepidum (Greenthroat Darter) in rivers draining the eastern Edwards Plateau, Etheostoma cf. lepidum (Texas Darter) in the Concho and San Saba rivers, and Etheostoma cf. lepidum (Pecos Darter) in the Pecos River. The Pecos Darter is likely highly imperiled due to its localized distribution and reliance on vanishing spring‐fed stream habitats. The impending biodiversity crisis makes integrative and swift species delimitation more necessary than ever. Our study exemplifies how classic taxonomic expertise combined with molecular phylogenetics can produce a more robust description of threatened biodiversity.

show abstract

Section: Discussionsupporting

confidence: 66%

Integrative ichthyological species delimitation in the Greenthroat Darter complex (Percidae: Etheostomatinae)

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In outcrop, it includes the Indio Formation and the Calvert Bluff Formation (Thorkildsen and Price, 1991;Stoeser et al, 2005). The Middle Wilcox subunit, bounded above and below by transgressive shales, records mild regression in a period of overall waning sediment supply that preceded the longer lived Upper Wilcox subunit, also known as the Carrizo Formation (Galloway, 2005(Galloway, , 2008Galloway et al, 2011).…”

Section: Wilcox Groupmentioning

confidence: 97%

“…We use the simplifi ed lithostratigraphy of Hargis (1996), which divides the Wilcox Group into three informal subunits, the Upper, Middle, and Lower Wilcox, but we include the Middle Wilcox with the Lower Wilcox because the two are not differentiated in regional geological maps or syntheses of the Gulf of Mexico ( Fig. 2; e.g., Brown et al, 1976Brown et al, , 1983Galloway et al, 2000;Stoeser et al, 2005;Galloway, 2008). High-resolution biostratigraphic calibration of the Wilcox Group by Crabaugh (2001) and Crabaugh and Elsik (2000) provided the following ages for each subunit: Lower Wilcox,Middle Wilcox,and Upper Wilcox,.0 Ma (±0.5 m.y.…”

Section: Wilcox Groupmentioning

confidence: 99%

Provenance of the Paleocene-Eocene Wilcox Group, western Gulf of Mexico basin: Evidence for integrated drainage of the southern Laramide Rocky Mountains and Cordilleran arc

Mackey¹,

Horton²,

Milliken³

2012

Geological Society of America Bulletin

View full text Add to dashboard Cite

Laramide basement blocks of the U.S. Rocky Mountain Province have long been considered the sediment source of the Paleocene-Eocene Wilcox Group, implying that large-scale progradation driven by Laramide uplift induced a transition from carbonate to clastic deposition in the Gulf of Mexico. Detrital zircon U-Pb age spectra from 10 samples collected from the Wilcox Group in south Texas reveal a complex grain assemblage with major age populations at ca. 1800-1300 Ma and 350-50 Ma and minor populations at 1300-950 Ma, 3250-1850 Ma, and 900-400 Ma. Modal data for Wilcox Group sand grain populations from the same region suggest a diverse provenance, including sources from the Cordilleran magmatic arc and subordinate reworked sedimentary rocks. Sediment was primarily derived from a mix of crystalline basement blocks in the U.S. southern Rocky Mountains and northern Mexico, the Cordilleran arc of western Mexico and the southwestern United States, and Mesozoic-Paleogene magmatic rocks of northern Mexico. Secondary sources include recycled strata from Sevier-Laramide basins in the southwestern United States and northern Mexico. Comparisons of detrital zircon U-Pb age spectra show that the Lower Wilcox subunit contains signifi cant magmatic arc-derived sediment, whereas the Upper Wilcox subunit is more enriched in basement and recycled sedimentary detritus. Therefore, the relatively quartzose composition of the bulk detrital assemblages throughout the Wilcox Group of south Texas is not an accurate refl ection of the range of volcanic and basement sources indicated by the associated U-Pb ages, suggesting signifi cant attrition of unstable grains during long-distance (>500-1000 km) transport.

show abstract

“…We obtained geo-referenced data on (i) presence and absence of S. parksii regularly sampled between 2004 and 2012 from the US Fish and Wildlife Service, Texas Parks and Wildlife Department, Texas Department of Transportation and the Texas A&M University team working under Drs Smeins and Rogers, (ii) average climatic conditions in our study area from the PRISM Climate group (2013 ) and (iii) landscape features including topographic characteristics derived from digital elevation models ( Gesch 2007 ), land cover ( Fry et al 2011 ), soil characteristics ( Soil Data Mart 2013 ) and geology ( Stoeser et al 2013 ). Spiranthes parksii surveys were conducted yearly during peak flowering for the duration of the study with systematic sampling across areas of known S. parksii occupancy and additional areas deemed likely to contain S. parksii due to similarity in habitat characteristics to known areas of occupancy.…”

Section: Methodsmentioning

confidence: 99%

Species distribution modelling for conservation of an endangered endemic orchid

et al. 2015

View full text Add to dashboard Cite

Navasota ladies'-tresses is an orchid native to eastern and central Texas. It was listed as endangered by the U.S. Fish and Wildlife Service in 1982 and by the State of Texas soon afterwards. Wang et al. (2015) analyzed field data collected over nine years to identify areas of critical habitat, areas into which the species could expand its range, and areas that might serve as conservation corridors. These results will provide valuable information for those interested in conservation and management of this endangered orchid as well as a framework for the development of future studies of this and other endangered plants.

show abstract

Geologic Map Database of Texas

Cited by 16 publications

References 0 publications

Integrative ichthyological species delimitation in the Greenthroat Darter complex (Percidae: Etheostomatinae)

Integrative ichthyological species delimitation in the Greenthroat Darter complex (Percidae: Etheostomatinae)

Provenance of the Paleocene-Eocene Wilcox Group, western Gulf of Mexico basin: Evidence for integrated drainage of the southern Laramide Rocky Mountains and Cordilleran arc

Species distribution modelling for conservation of an endangered endemic orchid

Contact Info

Product

Resources

About