married2rick Posted March 28, 2016 Share Posted March 28, 2016 (edited) I am trying to find some images of the Lancastria Trilobite from the Lancaster County, Pa area and I am not having any luck. I was in an area over the weekend where I collected some rocks with Olenellus & Salterella fossils and learned that the Lancastria was originally found at this same exact site! I just need to know what one looks like so I know what to look for when I start splitting rocks. Thanks! Edited March 28, 2016 by married2rick Link to comment Share on other sites More sharing options...
Raggedy Man Posted March 28, 2016 Share Posted March 28, 2016 The only Lancastria sp. I know of is from cambrian China. Do you have a species or just genus? Thanks Best regards, Paul ...I'm back. Link to comment Share on other sites More sharing options...
piranha Posted March 28, 2016 Share Posted March 28, 2016 Lancastria roddyi - Kinzers Formation, Lancaster County, PA: figures from: Whittington, H.B. (1995) Oryctocephalid trilobites from the Cambrian of North America. Palaeontology, 38(3):543-562 3 Link to comment Share on other sites More sharing options...
married2rick Posted March 28, 2016 Author Share Posted March 28, 2016 (edited) YAY!!!! Thank you Piranha! And thanks Raggedy Man too! I heard that the Lancastria Roddyi has 3 sets of 2 dots or circles on it but I didn't know where. It looks like they are on the head, would you agree? UGH! I just did a search on every combination of words and nothing! I need images! lol How do I find more images? Edited March 28, 2016 by married2rick Link to comment Share on other sites More sharing options...
piranha Posted March 28, 2016 Share Posted March 28, 2016 On 3/28/2016 at 4:27 PM, married2rick said: YAY!!!! Thank you Piranha! And thanks Raggedy Man too! I heard that the Lancastria Roddyi has 3 sets of 2 dots or circles on it but I didn't know where. It looks like they are on the head, would you agree? The 'dots' are apodemal pits; points of muscle attachment. 2 Link to comment Share on other sites More sharing options...
Raggedy Man Posted March 29, 2016 Share Posted March 29, 2016 I think your issue finding other images is due to lack of specimens documented and shared with the public..ie, private collections. It could also be that this trilobite is just incredibly rare for reasons unknown. I hope you find one or even a partial! Good luck. Best regards, Paul 1 ...I'm back. Link to comment Share on other sites More sharing options...
married2rick Posted March 29, 2016 Author Share Posted March 29, 2016 I am excited about finding one. This dig site has not seen much action over the years so I am feeling pretty optimistic about my chances. Question.... Is an Apodemal Pit an indent or a pock hole vs a bump or bubble? Link to comment Share on other sites More sharing options...
piranha Posted March 29, 2016 Share Posted March 29, 2016 On 3/28/2016 at 5:23 PM, married2rick said: I am excited about finding one. This dig site has not seen much action over the years so I am feeling pretty optimistic about my chances. Question.... Is an Apodemal Pit an indent or a pock hole vs a bump or bubble? Other descriptions after Whittington refer to them as glabellar pits. Pit is synonymous with terms like 'pock hole', 'indentation', etc., although these features would be reversed from the ventral aspect of the trilobite. Lobes and tubercles protrude, those would be more like 'bumps' or 'bubbles'. Here is larger resolution version of Whittington's figure 2: figure from: Shergold, J.H. (1969) Oryctocephalidae (Trilobita: Middle Cambrian) of Australia. Australia Bureau of Mineral Resources, Geology and Geophysics, Bulletin 104:1-66 2 Link to comment Share on other sites More sharing options...
married2rick Posted March 29, 2016 Author Share Posted March 29, 2016 Here is a pic of one of the Trilobites I found. I am assuming it is the Olenellus because they are common. I just don't want to mistake a Lancastria for a Olenellus! Link to comment Share on other sites More sharing options...
Fossildude19 Posted March 29, 2016 Share Posted March 29, 2016 (edited) I think it's Olenellus thompsoni. Piranha can correct me if I'm wrong. Excellent find, by the way! Regards, Edited March 29, 2016 by Fossildude19 1 Tim - VETERAN SHALE SPLITTER VFOTM --- APRIL - 2015 IPFOTM -- MAY - 2024 _________________________________________________________________________________ "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...
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