Inventory of Neoproterozoic and Paleozoic strata in Sonora, Mexico

Stewart, John H.; Poole, Forrest G.

doi:10.3133/ofr0297

Cited by 21 publications

(38 citation statements)

References 44 publications

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“…(Hayes and Landis, 1965), and the Whetstone Mountains (Wrucke and Armstrong, 1987) in southern Arizona. The Paleozoic sequence in the Sierra Los Ajos represents one of the more southerly exposures of cratonic-platform rocks deposited along the southern margin of Paleozoic Laurentia (Blodgett and others, 2002), although cratonic-platform rocks are present south of Sierra Los Ajos in the Bacoachi, Sonora, area (Stewart and Poole, 2002). Paleozoic rocks are underlain by the Proterozoic Pinal Schist, and are overlain by Upper Cretaceous strata equivalent to the Fort Crittenden and Salero Formations in Arizona, and the Cabullona Group in Sonora.…”

Section: Proterozoic Rocksmentioning

confidence: 98%

Stratigraphy and Mesozoic–Cenozoic tectonic history of northern Sierra Los Ajos and adjacent areas, Sonora, Mexico

Page

Gray

Iriondo

et al. 2010

Journal of South American Earth Sciences

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Section: Proterozoic Rocksmentioning

confidence: 98%

Stratigraphy and Mesozoic–Cenozoic tectonic history of northern Sierra Los Ajos and adjacent areas, Sonora, Mexico

Page

Gray

Iriondo

et al. 2010

Journal of South American Earth Sciences

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“…The limestones are typically gray, unmetamorphosed, and preserve 1-to 3-cm-thick bedding, which is generally east dipping and is locally folded into open to moderate folds about NE-trending fold axes. Conodonts and other fossils indicate a Lower Mississippian age for at least some of these limestones [Stewart and Poole, 2002]. Stewart et al…”

Section: P Ls : Paleozoic Limestonesmentioning

confidence: 99%

Geologic, structural, and thermochronologic constraints on the tectonic evolution of the Sierra Mazatán core complex, Sonora, Mexico: New insights into metamorphic core complex formation

Wong

Gans

2008

Tectonics

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The Sierra Mazatán in northwestern Mexico is the southernmost metamorphic core complex in the North American Cordillera. Large‐magnitude Tertiary extension at Sierra Mazatán involved both ductile and brittle slip along a major normal fault that presently dips 10°–15° west. Extension was polyphase and involved an early period of extension from 25 to 23 Ma followed by major slip from 21 to 16 Ma. Total slip was ≤20 km and occurred at rates of 3–4 mm/a. This extension predated the plate boundary change to transtension at ∼12 Ma and was largely decoupled from relative Pacific–North American plate motion. Numerous lines of evidence suggest that the presently low‐angle normal fault initiated at a steep dip (50°–60°) and was rotated to lower angles during slip. When corrected for this tilting, fault corrugations at Sierra Mazatán had a similar geometry to the segmentation of many active normal faults, which is compatible with their origin as primary fault features. Many aspects of the Sierra Mazatán are comparable to large active normal faults, indicating that this core complex formed owing to prolonged extension on an otherwise typical high‐angle normal fault. Therefore, core complexes need not represent a fundamentally unique mode of crustal extension.

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“…The total volume of the solid can be approached as the sum of the individual cylinder volumes. Conversely, to each cylinder corresponds a section of the solid and as the number of cylinders increases the approaching to volume improves (Stewart 2002). For instance, a simple method is defined choosing the cylinder diameter as that at a section end of the solid.…”

Section: Approximation Methods Of Calculus For Volume Estimation Of Smentioning

confidence: 99%

Theoretical evaluation of Huber and Smalian methods applied to tree stem classical geometries

León

Uranga-Valencia

2013

Bosque (Valdivia)

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SUMMARYHuber, Smalian and Newton methods, to estimate tree stem and log volume by sections, were theoretically evaluated applying them to the geometries of paraboloid, cone and neiloid. The study follows approximation procedures from calculus for volume estimation of solids of revolution as function of the number of segments and error analysis methods from forest measurement research. The errors in using Huber and Smalian methods have been determined. Additionally, it was algebraically proved that the Huber's error is exactly one half of the Smalian's error and opposite in sign. The results predict that, for any tree stem modeled classically, Huber's and Smalian's average absolute percent errors should be: less than 13.5 % and 27 %, respectively, for five or more segments; less than 7 % and 14 %, for 10 or more segments; less than 3.6 % and 7.2 %, for 20 or more segments; less than 2.5 % and 5 %, for 30 or more segments. This work provides a quantization on the classical theory of tree stem and log volume estimation. It could help to unify that theory and make it a more compact reference for forest measurement teaching and research.Key words: sectional methods, tree stem volume. RESUMENLos métodos de Huber, Smalian y Newton para estimar el volumen de troncos y trozas de árbol por secciones, fueron evaluados teóricamente, aplicándolos a las geometrías de paraboloide, cono, y neiloide. El estudio sigue procedimientos de aproximación del cálculo para estimación de volumen de sólidos de revolución, como función del número de segmentos, y métodos de análisis de error de investigación en mediciones forestales. Se han determinado los errores en el uso de los métodos de Huber y Smalian. Adicionalmente, se probó algebraicamente que el error de Huber es exactamente la mitad del error de Smalian y de signo opuesto. Los resultados predicen que, para cualquier tronco modelado clásicamente, los errores porcentuales absolutos promedio de Huber y de Smalian deberían ser: menores que 13,5 % y 27 %, respectivamente, para cinco o más segmentos; menores que 7 % y 14 % para 10 o más segmentos; menores que 3,6 % y 7,2 %, para 20 o más segmentos; menores que 2,5 % y 5 %, para 30 o más segmentos. Este trabajo proporciona una cuantificación sobre la teoría clásica de estimación de volumen de troncos y trozas de árbol. Podría ser de utilidad para unificar dicha teoría y hacerla una referencia más compacta para enseñanza e investigación sobre mediciones forestales.Palabras clave: métodos seccionales, volumen de tronco de árbol.

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Inventory of Neoproterozoic and Paleozoic strata in Sonora, Mexico

Cited by 21 publications

References 44 publications

Stratigraphy and Mesozoic–Cenozoic tectonic history of northern Sierra Los Ajos and adjacent areas, Sonora, Mexico

Stratigraphy and Mesozoic–Cenozoic tectonic history of northern Sierra Los Ajos and adjacent areas, Sonora, Mexico

Geologic, structural, and thermochronologic constraints on the tectonic evolution of the Sierra Mazatán core complex, Sonora, Mexico: New insights into metamorphic core complex formation

Theoretical evaluation of Huber and Smalian methods applied to tree stem classical geometries

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