tag:blogger.com,1999:blog-9210082840621538831.post6730010898779950340..comments2024-03-12T00:58:17.606-07:00Comments on Views of the Mahantango: Megastrophia (?) internal cast from the Mahantango fm.Davehttp://www.blogger.com/profile/04692840427188426893noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-9210082840621538831.post-89674301945670082272014-04-04T11:51:46.948-07:002014-04-04T11:51:46.948-07:00That sure is a Megastrophia. Nice find!That sure is a Megastrophia. Nice find!Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-9210082840621538831.post-58528708838830851182012-01-04T03:50:58.659-08:002012-01-04T03:50:58.659-08:00Jack - I see what you mean when you reference size...Jack - I see what you mean when you reference size and shape. I measured the specimen yesterday and it's roughly 50mm by 50mm which would put it more in the range for a Megastrophia. Also, the obovate outline that the fossil shows I think is the result of the distortion that is present in many of the fossils due to the regional syncline. Another issue are the adductor scars which, in the description on pg. 68 of "Stratigraphy and Paleontology of the Mahantango Formation", should be "narrow, elongate and bounded by diductor scars; Diductor scars small, deeply excavated, 'snow-shoe-shaped'". I don't see that in this specimen nor do the scars seem to match the illustrations on plate 6, #28-31, which show a very sharp and pointed beak that rapidly flares out towards the edges of the shell. What do you think? - DaveDavehttps://www.blogger.com/profile/04692840427188426893noreply@blogger.comtag:blogger.com,1999:blog-9210082840621538831.post-88963116910777645882012-01-02T19:00:12.621-08:002012-01-02T19:00:12.621-08:00Dave - I'm thinking this brachiopod is "S...Dave - I'm thinking this brachiopod is "Subrensselandia claypolii". The general obovate outline and strong muscle scar is a give away on the ID. A typical Mahantango Subrensselandia measures: length 38 mm and width 28 mm. In the Mahantango, "Megastrophia concava" measures: length 42 mm and width 60 mm. The Megastrophia is aways much wider that it is long. Check "Stratigrophy and Paleontology of the Mahantango Formation in South-Central PA" see pp 68 for more detail. I await your thoughts. Jack KAnonymousnoreply@blogger.com