Geobulletin alpha

News from the Geoblogosphere feed

by Stratigraphy.net
New from Snet: Lithologs, a new tool to create lithological/sedimentological logs online..

Posts treating: "William A. Oliver"

Tuesday, 05 August 2014

sort by: date | clicks

Favosite turbinatus coral from the Onondoga Formation 

Views of the Mahantango [2014-08-05 09:01:00]  recommend  recommend this post  (110 visits) info

 Devonian; US
img
Prior to finding the specimen below, Favosites turbinatus was a species that I'd found only in Givetian aged rocks. This specimen was found in the Edgecliff member of the Onondoga Formation south of Syracuse, NY. The fossil is somewhat cramped looking so let me walk you through the pictures.This is a view of the bottom of the coral. This is the side that would have been lying in the mud. Note that in this view the corrallites appear smooth but without an epitheca as though they were in contact [...]

Atrypa reticularis brachiopod from the Onondoga formation 

Views of the Mahantango [2014-08-03 09:01:00]  recommend  recommend this post  (667 visits) info

 US
img
The gigantic brachiopod fossil shown below is an Atrypa reticularis that I found in the Edgecliff member of the Onondoga formation.The size is rather remarkable to me but seems to be a similar trend in other brachiopods that I found at the same site. I guess the environment was rich enough to support individuals for a long period of time and storm events or predators were few.My initial ID was confirmed after reading  - STRATIGRAPHY OF THE ONONDAGA LIMESTONE (DEVONIAN) IN CENTRAL NEW YORK [...]

Coenites? coral from the Onondoga formation 

Views of the Mahantango [2014-08-01 09:01:00]  recommend  recommend this post  (94 visits) info

 Devonian; US
img
I found the plate shown below in a quarry south of Syracuse that exposes the Edgcliff member of the Onondoga formation (Devonian, Eifelian stage). It was the only piece I found with such densely packed corals. I'm not entirely sure on the ID but a review of - STRATIGRAPHY OF THE ONONDAGA LIMESTONE (DEVONIAN) IN CENTRAL NEW YORK By William A. Oliver, Jr (Bulletin of the Geological Society of America VOL. 66. PP. 621-662. JULY 1954). leads me to believe these could be Coenites sp.

Heterophrentis prolifica from the Onondoga formation 

Views of the Mahantango [2014-07-30 09:01:00]  recommend  recommend this post  (105 visits) info

 Devonian; US
img
One of the more common rugose corals I found in the Edgecliff member of the Onondoga Formation (Devonian, Eifelian stage), in rocks exposed in a quarry south of Syracuse, are the specimens below that I think are Heterophrentis prolifica. They are relatively small and highly curved which indicates to me that they were near the wave base and could easily get knocked over. Considering that the Edgecliff member is considered a Biostrome (an area that surrounds a reef but is not the reef itself) [...]

Platystoma gastropod from the Onondoga formation 

Views of the Mahantango [2014-07-28 09:01:00]  recommend  recommend this post  (97 visits) info

 Devonian; GR,US
img
I didn't find too many gastropod fossils in the quarry, south of Syracuse, NY that exposed the Onondoga formation, except for this specimen. It's been weathered quite a bit but still looks pretty good. It's a Platystoma sp. gastropod and was found in the Edgecliff member of the Onondoga formation (Devonian, Eifelian stage).The specimen above looks similar to some Platysoma sp. Gastropods that I have from the Haragan formation in Oklahoma (Devonian, Lockhovian stage).I looked through the paper [...]

Leptaena rhomboidalis and Levenea lenticularis brachiopods from the Onondoga formation 

Views of the Mahantango [2014-07-26 09:01:00]  recommend  recommend this post  (125 visits) info

 Devonian; US
img
Two more brachiopods that I found in a quarry near Syracuse this past May are this Leptaena rhomboidalis.... ...and what I think is a Levenea lenticularisBoth specimens come from the Edgecliff member of the Onondoga Formation (Devonian, Eifelian stage) and were ID'ed using the paper "STRATIGRAPHY OF THE ONONDAGA LIMESTONE (DEVONIAN) IN CENTRAL NEW YORK By William A. Oliver, Jr (Bulletin of the Geological Society of America VOL. 66. PP. 621-662. JULY

Meristella arcuata & Kozlowskiella raricesta brachiopods from the Onondoga formation 

Views of the Mahantango [2014-07-24 09:01:00]  recommend  recommend this post  (65 visits) info

 Devonian; US
img
I found these two types of brachiopod on the floor of a old quarry near Syracuse, NY. They come from the Edgecliff member of the Onondoga formation (Devonian, Eifelian stage). They are fairly weathered but based on the paper "STRATIGRAPHY OF THE ONONDAGA LIMESTONE (DEVONIAN) IN CENTRAL NEW YORK By William A. Oliver, Jr (Bulletin of the Geological Society of America VOL. 66. PP. 621-662. JULY 1954)." I have some tentative ID's.I think these are Meristella arcuata brachiopods Not enough detail [...]

Large Crinoid stems from the Onondoga Formation 

Views of the Mahantango [2014-07-22 09:01:00]  recommend  recommend this post  (115 visits) info

 Devonian; US
img
This past May I visited an old quarry south of Syracuse, NY that exposed part of the Onondoga formation (middle Devonian, Eifelian stage). The floor of the quarry exposed part of a Biostrome (an area that surrounds a reef but is not the reef itself) that is contained within the Edgecliff member. One particular layer was chock full of large diameter, stoloniferous crinoid stems.Specimen #1 (reassembled)Specimen #2 (reassembled)In places the stems seemed to be the substrate upon which everything [...]
Stratigraphy.net | Impressum
Ads: