File:Fossil shark tooth (Sanders Group, Mississippian; Henderson Creek roadcut, Lawrence County, Indiana, USA) 1 (34916012175).jpg
Original file (1,613 × 1,222 pixels, file size: 1.34 MB, MIME type: image/jpeg)
Captions
Captions
Summary edit
_1_(34916012175).jpg&action=edit§ion=1){kind=link}
| Description |
Fossil shark tooth from the Mississippian of Indiana, USA. The oldest known fish bones are fragments from the Upper Cambrian. Soft-bodied chordates referred to as “vertebrates” or “fish” are known from the Lower Cambrian and Middle Cambrian. The earliest, decent fossils of true fish are in the Ordovician. These remains show that the first fish lacked jaws. The evolution of jaws involved morphologic modification of the anterior pairs of gill arches. By the Devonian, jawed fishes had diversified into many distinct groups and became an important component of ancient oceans. The Devonian is often nicknamed “The Age of Fishes”. Seen here is the occlusal surface of a shell-crushing tooth from a fossil shark - probably Helodus. Classification: Animalia, Chordata, Vertebrata, Chondrichthyes, Euchondrocephali, Helodontidae Stratigraphy: float from the Ramp Creek Formation (middle Sanders Group, upper Osagean Stage, lower Malmeyeran Series, upper Lower Mississippian) or the Harrodsburg Limestone (middle Sanders Group, upper Osagean Stage to lower Meramecian Stage, middle Valmeyeran Series, upper Lower Mississippian to lower Middle Mississippian) Locality: talus from the base of a roadcut along Rt. 446, just south of Henderson Creek, due west of Norman Station, just east of due north of Heltonville (NE1/4 of section 14, T6N, R1E, Norman Quadrangle), central Pleasant Run Township, northeastern Lawrence County, south-central Indiana, USA |
| Date | |
| Source | Fossil shark tooth (Sanders Group, Mississippian; Henderson Creek roadcut, Lawrence County, Indiana, USA) 1 |
| Author | James St. John |
Licensing edit
_1_(34916012175).jpg&action=edit§ion=2){kind=link}
- 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@N05/34916012175 (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. |
File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:06, 7 December 2019 | | 1,613 × 1,222 (1.34 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
_1_(34916012175).jpg&oldid=517805547){kind=link}