Recent Outer-Shelf Foraminiferal Assemblages on the Carnarvon Ramp and Northwestern Shelf of Western Australia

Haller, Christian; Hallock, Pamela; Hine, Albert C.; Smith, Christopher G.

doi:10.2110/sepmsp.111.05

Cited by 1 publication

(1 citation statement)

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“…As recently reviewed and discussed by Hallock & Seddighi (2021), modern larger foraminifera have algal symbionts and are dependent on sunlight for photosynthesis, and so they thrive mostly in shallow clean-water carbonate environments. Based on recent studies of modern larger foraminifers (Haller et al, 2019;Hallock & Reymond, 2022), the larger foraminifers inhabiting low-light outer ramp environments tend to be smaller and have thinner test walls. Oron et al (2018) analyzed the growth trends of specimens of the modern larger foraminifer Operculina ammonoides (Gronovius, 1781).…”

Section: Parafusulina Deliciasensismentioning

confidence: 99%

Middle Permian (Guadalupian) Fusulinids from Subsurface Midland Basin, West Texas, USA, Including Paleoenvironmental Microspheric Parafusulina

Wahlman,

Nestell

2024

Journal of Foraminiferal Research

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Parafusulina fusulinids are preserved in partly dolomitized outer ramp facies in a Middle Permian (Guadalupian) subsurface core from the Midland Basin of West Texas. The fusulinid-bearing carbonate unit was deposited within the basin during a sea level lowstand of the Guadalupian G10 high-frequency sequence and is assigned to the Grayburg Formation. The lowstand carbonate unit consists of dolomitized progradational shallow-water carbonate ramp facies. The fusulinids are preserved only in outermost ramp fusulinid-skeletal packstone facies that overlies dark-gray quartz siltstone slope facies. The assemblage of Parafusulina species indicates that the carbonate unit is of late Roadian-early Wordian age based on the conodont chronostratigraphy. The lowest 1 ft (0.3 m) of the outermost ramp facies interval contains microspheric morphotypes of Parafusulina that could be the product of paleoenvironmental low-light conditions in the lower photic zone of an outermost ramp setting rather than sexual dimorphism.

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