Journal Articles (Earth and Atmospheric Sciences)
Items in this Collection
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2015-01-01
Donovan, S.K., Jones, B., Harper, D.A.T.
The first fossil echinoids are recorded from the Cayman Islands. A regular echinoid, Arbacia? sp., the spatangoids Brissus sp. cf. B. oblongus Wright and Schizaster sp. cf. S. americanus (Clark), and the clypeasteroid Clypeaster sp. are from the Middle Miocene Cayman Formation. Test fragments of...
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Ongoing, long-term evolution of an unconformity that originated as a karstic surface in the Late Miocene: A case study from the Cayman Islands, British West Indies.
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On Grand Cayman and Cayman Brac, karst development on the upper surface of the Cayman Formation during the late Miocene lowstand produced the Cayman Unconformity. On Grand Cayman, this led to the development of a deep, atoll-shaped depression on the western part of the island. The ensuing Lower...
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Petrographic and geochemical features of sinkhole-filling deposits associated with an erosional unconformity on Grand Cayman.
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On Grand Cayman, exposures of dolostones belonging to the Cayman Formation (Miocene) represent an erosional unconformity that has been developing since the late Pliocene (~ 3.6 Ma). Sinkholes that developed during this time have remained open or become partly to fully filled with various...
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2017-01-01
Aragonite and calcite crystals are the fundamental building blocks of calcareous thermal spring deposits. The diverse array of crystal morphologies found in these deposits, which includes monocrystals, mesocrystals, skeletal crystals, dendrites, and spherulites, are commonly precipitated under...
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2017-01-01
Many spring deposits throughout the world are characterized by spectacular deposits of calcium carbonate that are formed of various combinations of aragonite and calcite, and in very rare cases vaterite. The factors that control the precipitation of the aragonite and calcite have been the subject...
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Spatial variations in the stoichiometry and geochemistry of Miocene dolomite from Grand Cayman: Implications for the origin of island dolostone.
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The Cayman Formation (Miocene), ~ 140 m thick on Grand Cayman, is incompletely dolomitized with the most of the dolomite restricted to the peripheral part of the island. These calcium-rich dolomites, with 50–60 mol%CaCO3 (%Ca), are divided into low-calcium dolomite (LCD, %Ca < 55%) and...
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Stromatoporoid growth forms and Devonian reef fabrics in the Upper Devonian Alexandra Reef System, Canada – Insight on the challenges of applying Devonian reef models.
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Existing facies models for Devonian reef systems can be divided into high‐energy and low‐energy types. A number of assumptions have been made in the development of these models and, in some cases, criteria that distinguish important aspects of the models are poorly defined. The Upper Devonian...
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Temporal and environmental significance of microbial lamination: insights from Recent fluvial stromatolites in the River Piedra, Spain.
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Despite extensive research, the environmental and temporal significance of microbial lamination is still ambiguous because of the complexity of the parameters that control its development. A 13 year monitored record of modern fast‐accreting calcite stromatolites (mean 14 mm year−1) from...