Probable calcified metaphytes in the latest Proterozoic Nama Group, Namibia: origin, diagenesis, and implications

@article{Grant1991ProbableCM,
  title={Probable calcified metaphytes in the latest Proterozoic Nama Group, Namibia: origin, diagenesis, and implications},
  author={Stephen W. F. Grant and Andrew H. Knoll and G. J. Germs},
  journal={Journal of Paleontology},
  year={1991},
  volume={65},
  pages={1 - 18}
}
Samples from the Huns Limestone Member, Urusis Formation, Nama Group, at two adjacent localities in southern Namibia contain thin foliose to arched, sheet-like carbonate crusts that are 100–500 µm thick and up to 5 cm in lateral dimension. Morphologic, petrographic, and geochemical evidence supports the interpretation of these delicate crusts as biogenic, most likely the remains of calcified encrusting metaphytes. The original sediments of the fossiliferous samples contained aragonitic… 

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References

SHOWING 1-10 OF 112 REFERENCES

Genesis of stromatactis cavities between submarine crusts in Palaeozoic carbonate mud buildups

  • R. Bathurst
  • Geology, Geography
    Journal of the Geological Society
  • 1982
It is concluded that the sedimentary structure ‘stromatactis’ is a calcite cement-fill of a swarm of labyrinthine cavities developed in marine carbonate muds of Palaeozoic bioherms, commonly with

Aragonitic and high-Mg calcite caliche from the Persian Gulf-a modern analog for the Permian of Texas and New Mexico

Laminated, lacy, and pisolitic carbonate crusts have been found on and within some outcrops of Pleistocene limestones which rise above the modern sabkha surface in Abu Dhabi. These sediments are

Transformation of aragonite-dominated lime muds to microcrystalline limestones

Scanning electron microscopy of textures in several well-lithified Pleistocene “micrites” (mixed micrite and microspar) from south Florida and the Bahamas shows significant diagenetic alteration of

Calcification of Encrusting Aragonitic Algae (Peyssonneliaceae): Implications for the Origin of Late Paleozoic Reefs and Cements

ABSTRACT Encrusting aragonitic calcareous algae of the family Peyssonneliaceae are the largest group of calcified red algae outside the well-known Mg calcite Corallinaceae. They are distributed

Holocene and Pleistocene Calcareous Crust (Caliche) Profiles: Criteria for Subaerial Exposure

ABSTRACT Surficial, calcareous crust profiles, hard, irregular, subhorizontal, calcareous laminae, surrounded by crumbly, chalky carbonate, form at the surface of many limestone successions in

Microfacies and geochemistry of Middle Jurassic algal limestones from Scotland

Bathonian algal limestones from the Duntulm Formation of the Great Estuarine Group, western Scotland, are subdivided into three microfacies: cryptalgal laminites, thrombolites and

Distribution of High-Magnesium Calcite in Lime Muds of the Great Bahama Bank: Diagenetic Implications

ABSTRACT Studies of Pleistocene low-magnesium calcite analogs of Recent carbonate sediments indicate that the initial distribution of high-magnesium calcite in aragonitic sediments may play a

Primary Submarine Cements and Neomorphic Spar in a Stromatolitic-Bound Phylloid Algal Bioherm, Laborcita Formation (Wolfcampian), Sacramento Mountains, New Mexico, U.S.A.

Several mound-shaped bioherms with a maximum depositional relief of 12 m are developed within and upon a tabular limestone stratum in the middle of the Laborcita Formation (Lower Permian;

Multicellular thallophytes with differentiated tissues from Late Proterozoic phosphate rocks of South China

An assemblage of megascopic, multicellular thallophytes with well-preserved tissues and microstructures was discovered in phosphate rocks of the Late Proterozoic Doushantuo Formation (approximately
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