Part IV. Geology of the western part of the Sierra de Parras

Imlay, Ralph Willard

doi:10.1130/gsab-47-1091

Cited by 77 publications

(70 citation statements)

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“…Black carbonaceous shales of the La Casita Formation are found above the base, with a basal member representing a maximum flooding surface that covers a broader area than the preceding cycle that occurred in the Kimmeridgian age [21]. This formation consists of three members in the Sabinas basin, with the lower and upper members composed of shale and the middle member composed of sandstone interbedded with carbonates.…”

Section: Geological Settingmentioning

confidence: 99%

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Magnetic Susceptibility and Natural Gamma Radioactivity as Indirect Indicators of Impurities in Limestones of the Sabinas Basin: Possible Relationships with the Sedimentation Environment

Batista-Rodríguez¹,

Proenza²,

Dávila-Pulido³

et al. 2017

GEP

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This study presents an analysis of magnetic susceptibility and natural gamma radioactivity as indirect indicators of impurities in Cretaceous limestones of the Sabinas basin, as well as of the possible relation of these physical properties with the changes in the sedimentation environment. Both of these physical properties indicate changes in the degree of impurities and the mineralogical composition of this rock, principally in its organic matter and detritus content. Considering that the sedimentation environment determines the impurities in these rocks, possible environmental conditions at different levels of the Cretaceous were suggested using the magnetic susceptibility, total gamma radiation and potassium values, as well as the uranium and thorium concentration in the limestones. The analyses suggest variations in the depth of water table of the basin, which are mainly related to transgressions and marine regressions.

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Section: Geological Settingmentioning

confidence: 99%

“…Represented by interbed-ded shales and carbonates, the Taraises Formation was deposited during this period [21].…”

Section: Geological Settingmentioning

confidence: 99%

Magnetic Susceptibility and Natural Gamma Radioactivity as Indirect Indicators of Impurities in Limestones of the Sabinas Basin: Possible Relationships with the Sedimentation Environment

Batista-Rodríguez¹,

Proenza²,

Dávila-Pulido³

et al. 2017

GEP

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“…These authors reported the presence of Aptian ammonite assemblages from the State of Coahuila. Imlay (1936) defined a very distinctive lithostratigraphic unit , which he named the La Pefa Formation , characteristic of the Aptian of northern Mexico. Muir (1936), studied the geology of the Tampico region within the Tamaulipas State (Figure 2) in northeastern Mexico, and described a number of lithostratigraphic units of the Lower Cretaceous of that area, including the Tamaulipas Limestone.…”

Section: These Early Publications Not Only Provided Important Informamentioning

confidence: 99%

“…Samples were collected during four field seasons between the summer of 1995 and the summer of 1997. Field recognition of initial physical formational characteristics was based on previously established formal lithostratigraphic units by earlier workers (Imlay, 1936(Imlay, , 1937Muir, 1936;Humphrey, 1949) Unaltered rock samples collected for the purpose of microfacies studies and carbon/carbonate analyses were taken and documented for every individual bed of the two sequences. Extensive sampling for the study of ammonites was carried out specifically in the La Pena Formation at the Francisco Zarco section, because this was the only site where the ammonites occur in significant number at intermittent intervals.…”

Section: Field Workmentioning

confidence: 99%

Ammonite biostratigraphy, lithofacies variations, and paleoceanographic implications for barremian-aptian sequences of northeastern Mexico

Barragán¹

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“…Weber (1980) También hay descrita madera fósil sin identificar en facies litorales de la Formación Las Vigas (NeocomianoAptiano) en el flanco norte de la Sierra de Las Chorreras, aumentando en cantidad hacia el lugar denominado Plataforma del Diablo (Ferreiro, 1975), que no pudo ser localizado por Barrera-Escorcia (1982), Cuchillo Parado y Puerto Frío (Reyes, 1975) en la Sierra Cuchillo Parado (localidad 6 en Barrera-Escorcia, 1982). La Formación Las Vigas fue definida por Burrows (1910) en el valle del Río Conchos en Chorreras (Chihuahua) como una alternancia de areniscas calcáreas grises y lutitas y posteriormente fue redefinida por Imlay (1936) en el cañón Taraises (Durango) sugieriendo facies cercanas a la costa y posiblemente marinas. Este último autor interpretó este depósito como facies cercanas a la costa y posiblemente marinas y le confirió una edad de Aptiano inferior por la presencia de Dufrenoya Chatin, ammonita del Aptiano superior, en la Formación Cuchillo suprayacente.…”

Section: Macrofloraunclassified