Wikimedia Commons

File:Pentremites sp. (fossil blastoid) (Ramey Creek Member, Slade Formation, Upper Mississippian; Rt. 1274-Rt. 801 outcrop, southwest of Morehead, Kentucky, USA) (31049574517).jpg

Original file ‎(4,000 × 3,000 pixels, file size: 12.06 MB, MIME type: image/jpeg)

Captions

Captions

Add a one-line explanation of what this file represents

Summary

edit
Description

Pentremites sp. - fossil blastoid head in the Mississippian of Kentucky, USA.

Blastoids are an extinct group of echinoderms. They resemble crinoids in having a head, or theca, perched atop a long stem of stacked columnals composed of calcite. Crinoids and blastoids are pelmatozoans - stalked echinoderms. Both groups are sessile, benthic, filter-feeding organisms. The overall structure and morphology of crinoid heads and blastoid heads are quite different. Blastoid heads have pentaradial symmetry and somewhat resemble closed flower buds or nuts. They have five ambulacral grooves extending outward and downward from the summit of the theca. During life, many thin, delicate brachioles extended from the ambulacral grooves - these structures captured tiny particles of food from seawater as the blastoid engaged in filter feeding.

Classification: Animalia, Echinodermata, Blastozoa, Blastoidea, Spiraculata, Pentremitidae

Stratigraphy: shale-rich interval in the Ramey Creek Member, Slade Formation, Chesterian Series, Upper Mississippian

Locality: roadcut next to the Route 1274-Route 801 intersection, southwest of the town of Morehead, Kentucky, USA. (vicinity of 38° 04’ 51.58” North latitude, 83° 25’ 21.64” West longitude)

More info. at:

<a href="https://en.wikipedia.org/wiki/Blastoid" rel="noreferrer nofollow">en.wikipedia.org/wiki/Blastoid</a>
Date
Source Pentremites sp. (fossil blastoid) (Ramey Creek Member, Slade Formation, Upper Mississippian; Rt. 1274-Rt. 801 outcrop, southwest of Morehead, Kentucky, USA)
Author James St. John

Licensing

edit
w:en:Creative Commons
attribution
This file is licensed under the Creative Commons Attribution 2.0 Generic license.
You are free:
  • to share – to copy, distribute and transmit the work
  • to remix – to adapt the work
Under the following conditions:
  • attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/31049574517 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

7 December 2019

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current18:23, 7 December 2019Thumbnail for version as of 18:23, 7 December 20194,000 × 3,000 (12.06 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

You cannot overwrite this file.

The following page uses this file:

Metadata

This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.

Retrieved from "https://commons.wikimedia.org/w/index.php?title=File:Pentremites_sp._(fossil_blastoid)_(Ramey_Creek_Member,_Slade_Formation,_Upper_Mississippian;_Rt._1274-Rt._801_outcrop,_southwest_of_Morehead,_Kentucky,_USA)_(31049574517).jpg&oldid=616150544"