File:Conularia gratiosa (fossil conulariids) (Salem Limestone, Middle Mississippian; Spergen Hill, Indiana, USA) 3.jpg
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Summary
DescriptionConularia gratiosa (fossil conulariids) (Salem Limestone, Middle Mississippian; Spergen Hill, Indiana, USA) 3.jpg |
English: Conularia gratiosa Miller & Gurley, 1894 - fossil conulariids from the Mississippian of Indiana, USA. (public display, Geology Department, Wittenberg University, Springfield, Ohio, USA)
Conulariids are an uncommon to rare, extinct group of fossil organisms known from the Cambrian to the Triassic. They are most common in Mississippian sedimentary rocks. Their form is best described as "four-sided ice cream cones with ridges". They have a four-sided, tapering skeleton having tetrameral radial symmetry. The skeleton is somewhat flexible, often has a brownish color, and is composed of chitionphosphate (a mixture of chitin and calcium phosphate). Some paleontologists conclude it is an extinct group of cnidarians, or even a group of scyphozoan cnidarians. Others refer to conulariids as an extinct phylum. Available evidence indicates they are triploblastic, and so are not cnidarians at all, which are diploblastic. Very rare soft-part preservation shows the presence of an alimentary canal, with the pointed end of the skeleton oriented downward and attached to a sheath. Classification: Animalia incertae sedis, Conulata, Conulariida Stratigraphy: Salem Limestone, Middle Mississippian Locality: unrecorded/undisclosed site at or near Spergen Hill (apparently referring to a railroad cut just south of the town of Harristown - the type locality of the Salem Limestone), eastern Washington County, southern Indiana, USA |
Date | |
Source | Own work |
Author | James St. John |
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 04:24, 26 December 2018 | 3,161 × 2,604 (6.09 MB) | Jsj1771 | User created page with UploadWizard |
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ISO speed rating | 80 |
Date and time of data generation | 15:53, 24 March 2018 |
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Image title | |
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Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 18:03, 31 March 2018 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 15:53, 24 March 2018 |
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File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 14:03, 31 March 2018 |
Unique ID of original document | A9E17CA5DE482555D1BB3121ABDD1CC3 |