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• W4247793048 abstract "This study of Tepexi de Rodrı́guez (Puebla, Mexico), a mid-Cretaceous (Aptian?) locality with exceptional fossil preservation, combines statistically based microfacies-transition analysis with spectral analysis of depth-series measurements, in an attempt to constrain the paleoenvironmental setting. Tepexi de Rodrı́guez (Tepexi) is largely composed of laminated micrites, and presents a complex amalgam of primary and diagenetically altered fabrics. Modified Markov analysis of microfacies successions was used to assess repetitive patterns among primary microfacies. The reconstructed microfacies succession indicates recurring upward-fining sequences. Spectral analysis of depth-series measurements of magnetic susceptibility and RGB visible color (redness) reveals a pattern of repetition in the sedimentary sequence that is concordant with patterns of Milankovitch cyclicity. Strong eccentricity, obliquity, and semi-precessional signals are inferred. This suite of Milankovitch cyclicities is attributed to double-monsoon influences on Tepexi from both the northern and southern hemispheres, and implies an average rock accumulation rate of 2.0 cm/kyr. Previous reconstructions of Tepexi (e.g. a variety of back-reef lagoonal settings) do not match the observations reported here. Likewise, tidally influenced deposition is ruled out. Tepexi de Rodrı́guez appears to have been an open marine basin with storm-dominated sedimentation and bottom waters with restricted circulation. The fossil biota has a strong terrestrial influence, indicating that land was close by. Este estudio de Tepexi de Rodrı́guez (Puebla, México), una localidad cretácica media (Aptiana?) con una conservación de fósiles excepcional, combina análisis estadı́sticos basados en transición de microfacies con análisis espectral de medidas de series de profundidad, en un intento por determinar el escenario paleoambiental. Tepexi de Rodrı́guez (Tepexi) está principalmente compuesto de micritas laminadas, y presenta una amalgama compleja de texturas primarias y alteradas diagenéticamente. Análisis de Markov modificados de sucesiones de microfacies fueron utilizados para determinar patrones repetitivos entre las microfacies primarias. La sucesión de microfacies reconstruida indica secuencias repetitivas de adelgazamiento hacia arriba. Análisis espectral de medidas de series de profundidad de susceptibilidad magnética y RGB color visible (rojo) revela un patrón de repetición en la secuencia sedimentaria que es concordante con los patrones de los ciclos de Milankovitch. Señales fuertes de oblicuidad, excentricidad y semi-precesión son inferidas. El conjunto de ciclos de Milankovitch en Tepexi, se atribuye a influencia de doble-monzón de ambos hemisferios, norte y sur, e indica un promedio de la tasa de acumulación de roca de 2.0 cm/ka. Reconstrucciones previas de Tepexi (p.e una variedad del escenario lagunar post-arrecifal) no concuerda con las observaciones reportadas aquı́. También se descarta el depósito por la influencia de mareas. Tepexi de Rodrı́guez parece haber sido una cuenca marina abierta con sedimentación dominada por tormentas y las aguas del fondo con circulación restringida. La biota fósil tiene una influencia terrestre fuerte indicando que la tierra estaba cerca." @default.
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• W4247793048 date "2003-08-01" @default.
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• W4247793048 title "Genesis of a locality of exceptional fossil preservation: paleoenvironments of Tepexi de Rodgrı́guez (mid-Cretaceous, Puebla, Mexico)" @default.
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