Comparative Anatomy of Marine and Freshwater Algal Reefs, Bermuda and Central New York

Dean, Walter E.; Eggleston, Jane R.

doi:10.1130/0016-7606(1975)86<665:caomaf>2.0.co;2

Cited by 23 publications

(12 citation statements)

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“…In thin section and SEM, FGL microbialites have a microfabric of mixed micrite and shrubby crystalline calcite (Figure c,d). Micritic laminations are common throughout (Figure e); these laminations are less visible at the hand sample scale, and laminae are distinguished by trapped organic matter between layers, as was also observed by Dean and Eggleston (). Dark brown traces of organic matter are common along the outermost edges of the samples and trapped within the matrix.…”

Section: Resultssupporting

confidence: 72%

“…Both FGL microbialites and WDL tufas contain occasional ostracod shell fragments in pore spaces. The WDL tufas also contain molds of diatoms (Figure f), which were not observed in the FGL microbialites, although diatoms have been previously observed in FGL microbialites and linked to trapping and binding of carbonate sediment (Dean & Eggleston, ; Thompson et al, ; Wilhelm & Hewson, ). Notably, the WDL tufas contain large, millimeter‐scale, reworked spherulites, which are absent from FGL microbialites.…”

Section: Discussionmentioning

confidence: 68%

“…Bradley () offered one of the earliest descriptions of the deposits and showed that the spongy carbonate was precipitated around dense cyanobacterial mats, which he interpreted as the major contributor to the thrombolite texture. More recent work examining the FGL thrombolites confirmed that cyanobacteria are the major influence on thrombolite deposition via the following mechanisms: providing a biofilm and filament framework; initiating precipitation of calcite via photosynthesis; and trapping and binding carbonate sediments produced in the water column and/or by Chara macrophytes (Dean & Eggleston, ; Thompson et al, ). Textural features of FGL thrombolites interpreted as microbial in origin include laminations, trapped organic matter and organic staining, and occasional preserved microbial filaments and coccoid cells (Dean & Eggleston, ; Thompson et al, ).…”

Section: Discussionmentioning

confidence: 98%

“…Laminae in both FGL and WDL samples are typically wavy and non‐isopachous, characteristics associated with microbial influence on precipitation (Fedorchuk et al, ). Brown coloration along laminae and edges of pores is present in both samples and is interpreted as organic staining and/or trapped algal material (Dean & Eggleston, ). These organic‐rich layers may not preserve well; decay of organic matter from organic‐rich laminae would result in greater porosity in those laminae.…”

Section: Discussionmentioning

confidence: 99%

“…Bradley (1929) Thompson et al, 1990). Textural features of FGL thrombolites interpreted as microbial in origin include laminations, trapped organic matter and organic staining, and occasional preserved microbial filaments and coccoid cells (Dean & Eggleston, 1985;Thompson et al, 1990).…”

Section: Textural Comparison Of Fayetteville Green Lake Microbialitmentioning

confidence: 99%

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Microbially influenced lacustrine carbonates: A comparison of Late Quaternary Lahontan tufa and modern thrombolite from Fayetteville Green Lake, NY

et al. 2019

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Carbonate microbialites in lakes can serve as valuable indicators of past environments, so long as the biogenicity and depositional setting of the microbialite can be accurately determined. Late Pleistocene to Early Holocene frondose draping tufa deposits from Winnemucca Dry Lake (Nevada, USA), a subbasin of pluvial Lake Lahontan, were examined in outcrop, petrographically, and geochemically to determine whether microbially induced precipitation is a dominant control on deposition. These observations were compared to modern, actively accumulating microbialites from Fayetteville Green Lake (New York, USA) using similar methods. In addition, preserved microbial DNA was extracted from the Lahontan tufa and sequenced to provide a more complete picture of the microbial communities. Tufas are texturally and geochemically similar to modern thrombolitic microbialites from Fayetteville Green Lake, and the stable isotopic composition of organic C, N, inorganic C, and O supports deposition associated with a lacustrine microbial mat environment dominated by photosynthetic processes. DNA extraction and sequencing indicate that photosynthetic microbial builders were present during tufa deposition, primarily Chloroflexi and Proteobacteria with minor abundances of Cyanobacteria and Acidobacteria. Based on the sequencing results, the depositional environment of the tufas can be constrained to the photic zone of the lake, contrasting with some previous interpretations that put tufa formation in deeper waters. Additionally, the presence of a number of mesothermophilic phyla, including Deinococcus–Thermus, indicates that thermal groundwater may have played a role in tufa deposition at sites not previously associated with groundwater influx. The interpretation of frondose tufas as microbially influenced deposits provides new context to interpretations of lake level and past environments in the Lahontan lake basins.

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Section: Resultssupporting

confidence: 72%

Section: Discussionmentioning

confidence: 68%

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Textural Comparison Of Fayetteville Green Lake Microbialitmentioning

confidence: 99%

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Microbially influenced lacustrine carbonates: A comparison of Late Quaternary Lahontan tufa and modern thrombolite from Fayetteville Green Lake, NY

et al. 2019

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Sedimentology and palaeoenvironmental analysis of a karstic shallow carbonate lake (Early‐Middle Miocene, Sinj Basin, Croatia)

Vranjković,

Gierlowski‐Kordesch,

de Leeuw

et al. 2024

The Depositional Record

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In the Early to Middle Miocene, the post‐orogenic intramontane lacustrine Sinj Basin that belonged to the Dinarides Lake System evolved in the area of the External Dinarides. A composite 770 m thick stratigraphic column was measured spanning the basin's stratigraphy. Eight facies were differentiated. Four facies are almost entirely composed of freshwater carbonate deposits. Carbonate facies are divided into calcareous mudstone, charophytic micritic limestone, calcisiltite and coquina facies. They are interpreted to belong to a prograding carbonate bench on a gently inclined lake margin. In addition, tuff/clays, carbonate conglomerate, carbonate breccia and coal were differentiated. The tuff/clays are the result of remote volcanic eruptions, while the coarse‐grained sediments belong to subaqueous shallow stream channels or were deposited by gravity flows. The coal at the top of the measured succession, mostly of allochthonous origin, was deposited as a fen forest peat, representing the final stage of the lake. The formation of the Sinj Basin might have been triggered by dissolution of Permo‐Triassic evaporites, within the mostly carbonate basement but also by breakdown and collapse of Mesozoic and Palaeogene carbonate rocks and coalescence of contiguous sinkholes. The non‐tectonic interpretation of the basin genesis is a novel hypothesis explaining the origin of one of the Dinarides intramontane basins and is in contrast to previous considerations that evolution of the Sinj Basin was controlled by strike‐slip or extensional tectonics.

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Reefs, noncoral

Jablonski¹

1982

Beaches and Coastal Geology

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Comparative Anatomy of Marine and Freshwater Algal Reefs, Bermuda and Central New York

Cited by 23 publications

References 0 publications

Microbially influenced lacustrine carbonates: A comparison of Late Quaternary Lahontan tufa and modern thrombolite from Fayetteville Green Lake, NY

Microbially influenced lacustrine carbonates: A comparison of Late Quaternary Lahontan tufa and modern thrombolite from Fayetteville Green Lake, NY

Sedimentology and palaeoenvironmental analysis of a karstic shallow carbonate lake (Early‐Middle Miocene, Sinj Basin, Croatia)

Reefs, noncoral

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