tag:blogger.com,1999:blog-6574000839639433662.post5317414877808032799..comments2024-02-28T16:58:57.135-06:00Comments on Equatorial Minnesota: BrachiopodsJustin Tweethttp://www.blogger.com/profile/01792470288586894872noreply@blogger.comBlogger8125tag:blogger.com,1999:blog-6574000839639433662.post-16645116346219429862021-02-11T11:04:50.391-06:002021-02-11T11:04:50.391-06:00Thats interesting that your observations is more l...Thats interesting that your observations is more like bivalves as well. I had only found one fully shelled bivalve and a few that still have a bit of shell attached (vaux genus) mainly. I suspects canada website is similiar to here but they might had id it wrong anyway. After all inarticulate brachiopods and limpet like monoplacs is very poorly researched online. I was kinda thrown off by the fact that the specimens that I had collected while generally looks alike in outline but vary considerable in height with some more cone like (think Hawaiian shield volcano type cone) but guess that is because since they like to attach to shells and such they are more like lady slipper snails. Lady slipper snails can vary in shape a lot because they tend to stay in one spot a lot and shape their shells to fit that site. Tetradiumhttps://www.blogger.com/profile/01102073993243245243noreply@blogger.comtag:blogger.com,1999:blog-6574000839639433662.post-32370337407841291912021-02-11T10:56:14.546-06:002021-02-11T10:56:14.546-06:00Ok. I had two that is upside down. No whole ones s...Ok. I had two that is upside down. No whole ones so far. Only one tiny fossil so far that clearly is inarticulate brachiopod. By the way lilydale opened last year. With big snails I had to agree with you - I just looked at galena fossils from spring valley and one of the hormotoma is bigger than anything I had collected at Lilydale. To me decorah had the bigger strophomenids actually but is easier to work with - no large amount of rocks to haul off steep slopes, dusts generated when breaking apart rocks but limestone had better trilobites, etc so both had big pros and cons. The ostracodes are very widespread at lilydale. Consider most of platteville is inaccessible at lilydale (covered by a lot of dirt). If you are boring currently you can try visiting lilydale when weather warms up a bit but be careful of the slippery ice. That way you can get a general picture of it by the time weather warms up. Its pretty much the only way to accessible central and western clay pit as it is very marshy and thickly vegetative during growing season. Just stay away from steep cliffs, waterfalls. I suspects Decorah is more high wave action, thus poorer trilobites qualities and crinoids scattered. I had been to the keys Florida which had similar carbonate activities and the waves are quieter by compare. Limestone also seem to preserve graptolites as well, just noticed one of a different genus among my galena collection a few days ago. Tetradiumhttps://www.blogger.com/profile/01102073993243245243noreply@blogger.comtag:blogger.com,1999:blog-6574000839639433662.post-30445762028419793322021-02-09T18:41:47.992-06:002021-02-09T18:41:47.992-06:00Honestly, I suspect the photographed ?Achinacella ...Honestly, I suspect the photographed ?Achinacella arca aff is really a craniate brachiopod (looks almost exactly like the fossil in A, second photo, at https://equatorialminnesota.blogspot.com/2020/07/decorah-craniate-brachiopods.html); not sure about the patelliformis. It can be a pain to differentiate the two. The local genuine monoplacs I've seen (including a couple of the original type and figured specimens) are like other mollusk fossils in being steinkerns, similar in color to the matrix (unsurprisingly, because that's more or less what they are), although theirs could certainly be preserved differently.Justin Tweethttps://www.blogger.com/profile/01792470288586894872noreply@blogger.comtag:blogger.com,1999:blog-6574000839639433662.post-67285154646612161442021-02-09T18:32:26.229-06:002021-02-09T18:32:26.229-06:00Okay. The Platteville and Decorah certainly have s...Okay. The Platteville and Decorah certainly have some interesting faunal differences; I'd assume the muddier conditions for the Decorah are an important part of them. Off the top of my head from my own observations, the local Decorah has fewer strophomenids, fewer "large" snails, bivalves, and cephalopods, none of the big Eoleperdites-type ostracodes, and more bryozoans and crinoids. Smaller fossils in general, really.Justin Tweethttps://www.blogger.com/profile/01792470288586894872noreply@blogger.comtag:blogger.com,1999:blog-6574000839639433662.post-61805953163429996362021-02-09T12:46:30.309-06:002021-02-09T12:46:30.309-06:00Take a look at this website.
https://trenton.mcz.h...Take a look at this website.<br />https://trenton.mcz.harvard.edu/monoplacophora<br />After all trenton group had been mention by older authors. Plus one post said inarticulated brachipods mostly can be told by visible growth lines. Tetradiumhttps://www.blogger.com/profile/01102073993243245243noreply@blogger.comtag:blogger.com,1999:blog-6574000839639433662.post-26770401888297187972021-02-09T11:38:41.413-06:002021-02-09T11:38:41.413-06:00Nope I'm referring to your gastropod Id articl...Nope I'm referring to your gastropod Id article. I'm not being picky with you considering the lack of information or misleading information from authors 80 years or more ago. The weird thing about Platteville (I had to shuffle some genus around as I learn more recently) is that Rafinesquina minnesotensis and (I think) both Oepikina along with Strophomena billingsi? is far more common in there than decorah. I will try to upload some pics this week - right now im looking at inarticulated brachiopods and maybe limpet- like mono. Already id roughly 5 or so bivalve species (some tiny ones are more common than people thinks). Tetradiumhttps://www.blogger.com/profile/01102073993243245243noreply@blogger.comtag:blogger.com,1999:blog-6574000839639433662.post-35857686557322915972021-02-06T12:45:19.702-06:002021-02-06T12:45:19.702-06:00Are you referring to gastropods on the block photo...Are you referring to gastropods on the block photographed on this page, or in a gastropod post? I admittedly am mostly restricted to the lower third of the Decorah, and I generally don't try to identify to the species level.Justin Tweethttps://www.blogger.com/profile/01792470288586894872noreply@blogger.comtag:blogger.com,1999:blog-6574000839639433662.post-87275838402866941272021-02-02T13:32:34.655-06:002021-02-02T13:32:34.655-06:00Lol I had trouble figuring the Stropomenid brachio...Lol I had trouble figuring the Stropomenid brachiopods because of their similiarity. Just let you knows I just uploaded some pics on my member profile on fossil id website. Still a lot more to add but you missed a couple more of gastropods (Hormotoma trentonense and one holopea species). I guessed at holopea species because I found three specimen. For a while I had two partial which was confusing before finally found an intact one in Decorah. Its like apple snail - a few smooth whorls sudden widen out. Tetradiumhttps://www.blogger.com/profile/01102073993243245243noreply@blogger.com