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Showing results for tags 'ordovician'.
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From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota
Lepidocyclus - Decorah Formation only? For me I hadn't found it in Platteville formation for unknown reason - could be locations. Very abundant and highly variable in forms - I suspects quite a few genus and species can be easily mistaken for this one. Part of it is I only find the smallest ones as strongly triangular and more flat with sulcus not as prominent. But all the bigger one are much more inflated. Plus costae is pretty uniform over all species. Transverse growths are sometimes prominent on anterior portion of the shell, usually on adult specimens. -
From the album: Brachiopods of Platteville/Decorah Twin Cities Minnesota
Rhynchotrema ainslei Decorah shale, Twin Cities Minnesota. This species appear to be much less common than Rhynchotrema wisconsinense. How to tell the two species apart? Rhynchotrema have much more costae than R. wisconsinense. Size and shape are variable, but compare to R. wisconsinense R. ainslei is more fragile and more easily deformed by the fossilization procession. -
From the album: Bryozoan of Minnesota Ordovician
Strictoporellina cribrosa uncommon Decorah Formation. Least common of the porous frondose types. Pretty solid flat with pores ridden it. No other variability in shapes. -
From the album: Corals of Decorah Minnesota
Lambeophyllum profundum common decorah formation,, uncommon to rare platteville formation. Very variable in size, with one inch being average, 2 to 3 inches at the biggest. -
From the album: Corals of Decorah Minnesota
closeup of Lambeophyllum profundum. Rightmost center is unusual rare in many polyps growing together - usually Lambeophyllum profundum loves to be single. -
From the album: Corals of Decorah Minnesota
Lichenaria typa Uncommon and is very specialized into encrusting on bryozoan, either rugosa or praespora. Mostly tiny with the center right the largest. -
From the album: Corals of Decorah Minnesota
Aulopora trentonese Rarely on horn corals or mostly exposed. Seem to prefer bryozoans with bryozoans mostly covering them so if you see abnormal numbers of large pores on bryozoan there's Aulopora on them. Learned that piece of information from similar Devonian corals of Iowa. -
From the album: Corals of Decorah Minnesota
Platteville formation Lambeophyllum profundum. Outer laver are gone. Uncommon to rare. -
From the album: Corals of Decorah Minnesota
Unknown coral species. Cant find any information on Ordovician lookalikes. Very small polyps. Top Left is very light and I almost threw it away but notice the tiny coral structures in it. Generally oval in shapes, rarely lobed. Uncommon to rare. -
From the album: Corals of Decorah Minnesota
Lambeophyllum profundum with outer layer decayed away. -
From the album: Bivalves of Platteville/Decorah Formation Minnesota
Ctenodonta longa - rare Decorah Twin Cities. Tiny actually. -
From the album: Bivalves of Platteville/Decorah Formation Minnesota
Ctenodonta species. Localized common in very fine light shell hash. Hard to make out other details. -
From the album: Bivalves of Platteville/Decorah Formation Minnesota
Ctenodonta hamburgensis Decorah Formation. Rare. This one is unusual in most of shell is perserved, only a chuck missed from right side. -
From the album: Bivalves of Platteville/Decorah Formation Minnesota
Vanuxemia sardesoni Platteville only that I know of. Much more flatter and wider than other Vanuxemia species. Uncommon. -
From the album: Bivalves of Platteville/Decorah Formation Minnesota
Vanuxemia obstusifrons Common in Decorah formation, uncommon in Platteville Formation. Vary considerable in sizes. -
From the album: Bivalves of Platteville/Decorah Formation Minnesota
Overexposure light when taking picture so blue appear to be the best for me so far. Rare Decorah Formation Ordovician Twin Cities Minnesota. Deceptrix planodorsata is what I figures this bivalve is. Kind of reminds me of certain modern nut clam species. -
From the album: Bivalves of Platteville/Decorah Formation Minnesota
Back side of guessing Orthodesma schucherti. Showing perserved part of shell. -
From the album: Bivalves of Platteville/Decorah Formation Minnesota
Guessing Orthodesma schucherti. Rare Decorah twin Cities Minnesota. -
From the album: Bivalves of Platteville/Decorah Formation Minnesota
Guessing Modiolopsis arguta. It is the bigger of similar shaped bivalves that I have found. Uncommon to rare Decorah formation so far. The top right is the hinge. Ordovician, Twin Cities Minnesota. -
From the album: Bivalves of Platteville/Decorah Formation Minnesota
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From the album: Trilobites
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- ordovician
- russia
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How Tiny Plants Changed the Planet, 450 Million Years Ago
Oxytropidoceras posted a topic in Fossil News
Clear as Mud: How Tiny Plants Changed the Planet, 488 Million Years Ago, California Institute of Technology, January 28, 2021 The paper is: Zeichner, Sarah S. and Nghiem, Justin and Lamb, Michael P. and Takashima, Nina and de Leeuw, Jan and Ganti, Vamsi and Fischer, and Woodward W. (2021) Early plant organics increased global terrestrial mud deposition through enhanced flocculation. Science, 371 (6528). pp. 526-529. ISSN 0036-8075 Note: The paper's summary says 450 million years ago, not 488 million years ago as stated in the press release. Yours, Paul H.-
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- bryophytes
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Is this Fezouata hurdiid fake?
JUAN EMMANUEL posted a topic in Is It Real? How to Recognize Fossil Fabrications
Hello guys, so this specimen came up on the internet for sale. It is apparently a Aegirocassis benmoulai from the one and only Fezouata formation in the Draa Valley in Morocco. I am not trained with dealing with these types of specimens but what are the chances it is the real deal/thing??
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Two very rare Ordovician fossils from the Fezouata Formation of Morocco. Any ideas?
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Hi All, Wondering if I can get some ID help with this, after reviewing various sources I am thinking Maclurites? Location: Belvedere Quarry (ESCONI trip 2020) Dolomite, Galena formation Thank you!
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