Lithofacies and stacking architecture of a middle Pennsylvanian inner platform, bug scuffle member, gobbler formation, Fresnal Canyon, New Mexico

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Title: Lithofacies and stacking architecture of a middle Pennsylvanian inner platform, bug scuffle member, gobbler formation, Fresnal Canyon, New Mexico
Author: LaPeter, Danielle
Abstract: The Bug Scuffle Member of the Gobbler Formation is part of an extensive Middle Pennsylvanian carbonate platform that accreted on the western edge of the Pedernal Uplift . A section exposed in Fresnal Canyon of the Sacramento Mountains , New Mexico occupies an inner platform position kilometers from the platform margin . The uppermost 173m of the Bug Scuffle was examined in two continuous sections to identify the lithofacies and stratal architectures of this inner platform icehouse system . Two composite sequences were identified based on facies and bedset thickness trends and a sandstone filled incised valley representing the greatest fall in sea level . Only the three uppermost high frequency sequences (HFS ) of the lower composite sequence are exposed . These sequences are comparatively thick (20 -30m ) and are bounded by weak to well developed exposure surfaces . Parasequences and parasequence sets are poorly developed , with lithofacies dominated by deep to high - energy shallow marine lithofacies . The upper composite sequence is composed of at least 11 HFS . Contrary to many described icehouse platforms , exposure surfaces are not developed between the lower HFS such that they might be better described as parasequence sets (PSS ) . The lowest PSS is dominated by a deep platform crinoidal lithofacies and is considered the Transgressive Sequence Set . The overlying parasequence sets are dominated by phylloid algal and diverse skeletal lithofacies . These thick (15 -20m ) PSS are overlain by packages of distinctly different lithofacies and architecture that are composed of a phylloid unit , capped by a peloidal - coated grain grainstone and /or a distinctive gastropod lithofacies , and bounded by well developed exposure surfaces . These thin (2 -10m ) packages represent classic icehouse HFS . This evolution from thick PSS dominated by open marine facies to thin HFS containing significant restricted marine facies with well developed exposure surfaces reflects the long – term loss of accommodation space on the platform and represents the transition from early to late Highstand Sequence Set . This example highlights that a range of stratal motifs may characterize Late Paleozoic icehouse platforms and that classic icehouse HFS may be just one end member within a given platform .
URI: http : / /hdl .handle .net /2346 /14750
Date: 2007-12

Citation

Lithofacies and stacking architecture of a middle Pennsylvanian inner platform, bug scuffle member, gobbler formation, Fresnal Canyon, New Mexico. Master's thesis, Texas Tech University. Available electronically from http : / /hdl .handle .net /2346 /14750 .

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