EMP Posted February 24, 2017 Share Posted February 24, 2017 I've wanted an id for these trilobites for a while now. Some of my first trilobite finds. I have no clue what species these are, and knowing that will allow me to finally settle how old one of my favorite sites is. The formations exposed in the area range from the lower Silurian Rose Hill Formation to the upper Devonian Scherr Formation. Long time period, but I know there are some really knowledgeable people on the forum about trilobites and I'm sure someone would be able to give me a solid id at least to genus and period age. Link to comment Share on other sites More sharing options...
Darktooth Posted February 24, 2017 Share Posted February 24, 2017 Can you try to take some better pics? They appear blurry and out of focus. And there is too much glare on your close-up pic. I like Trilo-butts and I cannot lie. Link to comment Share on other sites More sharing options...
EMP Posted February 24, 2017 Author Share Posted February 24, 2017 These any better? Link to comment Share on other sites More sharing options...
Darktooth Posted February 24, 2017 Share Posted February 24, 2017 I am sorry but I am having trouble seeing enough detail. I like Trilo-butts and I cannot lie. Link to comment Share on other sites More sharing options...
FossilDAWG Posted February 24, 2017 Share Posted February 24, 2017 You have the light directly on the specimen so everything looks washed out and there is no depth perception. Try angling to light to create shadows to bring out the surface detail. Also don't worry about getting the whole rock in the photo, just get as close as you can to the actual fossil. Don 1 Link to comment Share on other sites More sharing options...
Fossildude19 Posted February 24, 2017 Share Posted February 24, 2017 Body impressions of trilobites are hard to ID without cephalon or pygidium. Any ideas on a faunal list for the area? Regards, 1 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 __________________________________________________ "In every walk with nature one receives far more than he seeks." John Muir ~ ~ ~ ~ ><))))( *> About Me Link to comment Share on other sites More sharing options...
piranha Posted February 24, 2017 Share Posted February 24, 2017 1 hour ago, Fossildude19 said: ...Any ideas on a faunal list for the area?... Dalmanites limulurus, Diacalymene macrocephala, Liocalymene cresapensis, Trimerus delphinocephalus are the common trilobites in the Rose Hill Fm. This monograph has a lot of info on the Rose Hill fossils: Swartz, C.K. & Prouty, W.F. (1923) Maryland Geological Survey (Silurian). Johns Hopkins Press, 794 pp. There are no trilobites in the Scherr Fm. Scherr Formation Fossils Arthroacantha ithacensis Aulacella sp?Cariniferella elmira Cornellites chemungensis Cytospirifer chemungensis Eoschizodus sp? Douvillina cayuta Douvillina mucronatus Douvillina variabilis Nervostrophia nervosa Nervostrophia nevosa var. mucronata Productella speciosa Productella spinulacosta Pseudoatrypa devoniana Spinatyrpa spinosa Thiemella leonensis Vertumina reversa Whidbornella lachrymosa 2 Link to comment Share on other sites More sharing options...
doushantuo Posted February 24, 2017 Share Posted February 24, 2017 MDUSA edit:Large download Link to comment Share on other sites More sharing options...
doushantuo Posted February 24, 2017 Share Posted February 24, 2017 I'm no expert,but isn't T.delpinocephalus conspecific with a Homalonotus species(lobatus)? Link to comment Share on other sites More sharing options...
EMP Posted February 24, 2017 Author Share Posted February 24, 2017 Any idea what genus they could be Piranha? Link to comment Share on other sites More sharing options...
EMP Posted February 24, 2017 Author Share Posted February 24, 2017 7 hours ago, piranha said: Dalmanites limulurus, Diacalymene macrocephala, Liocalymene cresapensis, Trimerus delphinocephalus are the common trilobites in the Rose Hill Fm. This monograph has a lot of info on the Rose Hill fossils: Swartz, C.K. & Prouty, W.F. (1923) Maryland Geological Survey (Silurian). Johns Hopkins Press, 794 pp. There are no trilobites in the Scherr Fm. Scherr Formation Fossils Arthroacantha ithacensis Aulacella sp?Cariniferella elmira Cornellites chemungensis Cytospirifer chemungensis Eoschizodus sp? Douvillina cayuta Douvillina mucronatus Douvillina variabilis Nervostrophia nervosa Nervostrophia nevosa var. mucronata Productella speciosa Productella spinulacosta Pseudoatrypa devoniana Spinatyrpa spinosa Thiemella leonensis Vertumina reversa Whidbornella lachrymosa Any idea on what genus at least Piranha? I know that in the Needmore and Mahantango Formations there are Phacops and Proetus trilobites. Link to comment Share on other sites More sharing options...
piranha Posted February 24, 2017 Share Posted February 24, 2017 12 hours ago, doushantuo said: I'm no expert,but isn't T.delpinocephalus conspecific with a Homalonotus species(lobatus)? Trimerus lobatus Tomcykowa 1975 is a synonym of Homalonotus lobatus. H. lobatus is a synonym of T. delphinocephalus. ABSTRACT: T. permutus nom. n. is proposed for the preoccupied specific name, Trimerus lobatus Tomczykowa, 1975, Silurian trilobite of Poland. The name Homalonotus lobatus introduced by Prouty (1923) for trilobite from Silurian of Maryland, appeared to be a junior synonym of Trimerus delphinocephalus Green, 1832, as the name for juvenile stages. QUOTE: "The comparison of the latex casts showed that Homalonotus lobatus Prouty, 1923, is conspecific with Trimerus delphinocephalus Green, 1832, represented by the juvenile forms; therefore, its should be considered the junior synonym of the former species." Tomczykowa, E. (1978) A new specific name for Trimerus lobatus Tomczykowa, 1975, and taxonomic value of Homalonotus lobatus Prouty, 1923. Acta Palaeontologica Polonica 23(2):195-198 7 hours ago, EMP said: Any idea what genus they could be Piranha? It might be possible with better photos. 1 Link to comment Share on other sites More sharing options...
EMP Posted February 24, 2017 Author Share Posted February 24, 2017 Any idea what genus they could be Piranha? It might be possible with better photos. Do any of these help? I don't want much, just your guess as to what the age is. At that point I think I could start narrowing it down a bit. Link to comment Share on other sites More sharing options...
piranha Posted February 24, 2017 Share Posted February 24, 2017 Unfortunately none of the photos show anything diagnostic. 1 Link to comment Share on other sites More sharing options...
EMP Posted February 24, 2017 Author Share Posted February 24, 2017 Not even to family or if its from the Silurian or Devonian? Link to comment Share on other sites More sharing options...
piranha Posted February 24, 2017 Share Posted February 24, 2017 21 minutes ago, EMP said: Not even to family or if its from the Silurian or Devonian? I would like to give you a better answer, but unfortunately they are indeterminate fragments. Link to comment Share on other sites More sharing options...
EMP Posted February 25, 2017 Author Share Posted February 25, 2017 Guess it'll just have to be a mystery then Link to comment Share on other sites More sharing options...
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