Solenopora sp. (fossil red algae) (Corryville Member, McMillan Formation, Upper Ordovician; Flemingsburg South roadcut, Fleming County, Kentucky, USA) 51 : 無料・フリー素材/写真
Solenopora sp. (fossil red algae) (Corryville Member, McMillan Formation, Upper Ordovician; Flemingsburg South roadcut, Fleming County, Kentucky, USA) 51 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Solenopora sp. - fossil red algae in limestone in the Ordovician of Kentucky, USA.This fossil is in the famous Cincinnatian Series of the tristate area of Ohio-Kentucky-Indiana. Rocks in the Cincinnatian were deposited in relatively shallow marine facies during the Late Ordovician. The Cincinnatian succession is mostly interbedded limestones and shales. Most of the limestones are event beds (= tempestites), deposited during ancient storms.The odd-shaped structure seen here is a rhodophyte - a fossil red alga. Rhodophytes they are the most common and widespread of marine macroalgae, but they often go unnoticed in modern oceans because of their frequently-dull coloration and nondescript growth forms. Over 7000 species of red algae are known in the Holocene - most of them are marine, plus some freshwater forms. Rhodophytes are also known in the fossil record. Very old fossil red algae have been reported from the upper Mesoproterozoic (~1.2 Ga) of northern Canada.Modern red algae vary in color - not all are reddish. Rhodophytes can be red, pink, pale pink, lavender, purple, brownish-red, whitish, and yellowish. Fleshy red algae are usually weed-like to mossy to fuzzy in appearance. Calcareous red algae have skeletons with calcium carbonate (CaCO3 - calcite or aragonite). Calcareous red algae are important reef organisms - they include branching forms and crusts. Upon death, the hard part skeletal components of calcareous red algae become biogenic sediments in reef and peri-reef environments.Classification: Rhodophyta, Florideophyceae, Corallinales, SolenoporaceaeStratigraphy: Corryville Member, McMillan Formation/Grant Lake Formation, Maysvillian Stage, middle Cincinnatian Series, Upper OrdovicianLocality: Flemingsburg South Outcrop - roadcut along Route 11, next to quarry entrance, south of the town of Flemingsburg, Fleming County, northeastern Kentucky, USA (38° 22’ 50.44” North latitude, 83° 44’ 54.93” West longitude) |
| 撮影日 | 2018-03-11 09:53:58 |
| 撮影者 | James St. John |
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