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Showing results for tags 'petrocrania'.
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Show us your Devonian Epizoans & Pathological Brachiopods!
Brach3 posted a topic in General Fossil Discussion
Dear all, if Devonian Epizoans (Epibionts) & Pathological Brachiopods (all the periods) are a fascinating group of fossils for you and you want to discuss anything about their paleoecology, please post your photos (specimens) in this thread.- 225 replies
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- ascodictyon
- attachment scars
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- ascodictyon
- attachment scars
- aulopora
- barnacles
- bore traces of predation
- botryllopora
- brachiopods
- brachiopods life position
- bryozoa
- cephalopod predation
- coprolites
- cornulites
- crinoidea
- ctenostomata
- cyclostomata
- cystoporata
- damage to brachiopods
- drill holes
- durophagy
- ecological interactions
- eliasopora
- encrusters
- endoskeletobionts
- epibionts
- epifauna
- epizoans
- fistuliporoids
- graptolites dendroid
- hederella
- holdfasts
- incertae sedis
- life orientation
- microconchida
- microconchus
- microproblematica
- muscle scars
- organic threads
- palaeoconchus
- palaeoecology
- paleobiology
- paraspirifer
- petrocrania
- phizhedxa
- podichnus
- polychaeta
- predation
- predation damage
- prestomata
- pseudobryozoans
- repair of shell breakage
- repair scar
- ropaionaria
- rugosa
- rugose coral
- sclerobionts
- sedentaria
- shell breakage
- shell repair
- sphenothallus
- spinocyrtias
- sponges
- stenopora
- trepos
- trepostomata
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From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota
Acanthocrania setigera is described as only difference in having spinosa/pillose ornamentals on the outside which is a vague definition to me and is possible invalid name. So I'm just using Petrocrania halli for now. Occurs in mifflin section of Platteville Formation and Decorah Formation. Most common inarticulated brachiopod in Decorah formation.- 1 comment
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- brachiopod
- inarticulated brachiopod
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Crania Crania modesta is a rare calcium carbonate Pennsylvanian inarticulate brachiopod. The shell is very thin and the ornamentation of the shell below shows through. You can see the interior of a near circular 4.6 by 4.8 mm pedicle valve that attached itself to aLinoproductus prattenianus (photo #1). A bryozoan also covers the front and back of the Linoproductus (photos #2 & #4). Photo #2 is a different photo of the same Crania as in photo #1. The Crania has a thickened rim and a sub central knob. Rowell (1965, p. 289) lists Crania as the only Pennsylvanian genus with a calcified pedicle valve as stated by Sutherland (1973, p. 16). The presence of a large bryozoan colony on the backside of the Linoproductus valve (photo #4) suggests why only the pedicle valve of the Crania was preserved. The entire Linoproductus shell with the Crania and small bryozoan colony on top (photo #2) was flipped over allowing the bryozoan to grow on the other side. The brachial valve dissolved away or was broken off from exposure before it was buried. The brachial valve was probable very thin like the pedicle valve. Taxonomy from GBIF. Photo 3 from plate 11, figure 17 from Mudge 1962. Mudge, M. R., Yochelson, E. L., Douglas, R. C. et al. 1962. Stratigraphy and Paleontology of the Uppermost Pennsylvanian and Lowermost Permian Rocks in Kansas. United States Geological Survey Professional Paper 323:1-213. https://pubs.usgs.gov/pp/0323/report.pdf Rowell, A. J. 1965. Inarticulata. In: R.C. Moore (ed.), Treatise on Invertebrate Paleontology. Part H. Brachiopoda, H260–H296. Geological Society of America and University of Kansas Press, Boulder. Sutherland, P. K. and F. H. Harlow. 1973. Pennsylvanian brachiopods and biostratigraphy in southern Sangre de Cristo Mountains, New Mexico. Memoirs of the New Mexico Bureau of Mines and Mineral Resources 27:1–171. Free download: https://geoinfo.nmt.edu/publications/monographs/memoirs/27/ First description in: White, C. A. and St. John, O. H. 1867. Descriptions of new sub-Carboniferous and Coal Mesures fossils collected upon the geological survey of Iowa, together with a notice of new generic characters observed in two species of brachiopods. Transactions of the Chicago Academy of Sciences 1:115-127.
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- arizona
- crania modesta
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From the album: Ordovician Fossils (by Peat Burns)
Petrocrania scabiosa (Brachiopoda) Late Ordovician: Richmondian Stage Indiana, USA© 2017 Peat Burns - All Rights Reserved
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- brachiopoda
- indiana
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