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Hello. There are so many smart members here & I'm just hoping you can put up with someone who didn't listen in science class posting pictures for ID. I've always picked up rocks & what not that look interesting to me & have been content just admiring their beauty. Looking forward to trying to learn at least some basic identification.
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I found this small (~0.5cm in width) bone fragment in Middle/Upper Devonian of Iowa. It has a couple of interesting features that separate it from the usual nondescript bone chunks I find, including many small pores and a pronounced ridge. Hopefully the pictures capture these well. Any thoughts as to what it might be? Maybe a scale of some sort? Thanks.
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From the album: Lime Creek Devonian Rockford Iowa
trace fossils. I hadn't really found that much variety in trace fossils from the area. The largest is easily 2 inches in diameter -
Nervostrophia rockfordensis and Nervostrophia camerata
Tetradium posted a gallery image in Member Collections
From the album: Lime Creek Devonian Rockford Iowa
Left is my entire collection of Nervostrophia rockfordensis. Uncommon, much larger and flatter than the right which is Nervostrophia camerata of which is very abundant and only some are shown here. Nervostrophia camerata is variable in shapes, either having a wing projective that is very distinct from other brachiopods or lacking it entirely.-
- brachiopod
- devonian
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From the album: Lime Creek Devonian Rockford Iowa
Devonoproductus walcotti This is is my first of the Productid branch of the brachiopod family tree as none exists in Ordovician. Typically both halves separated. This one is unusual for a brachiopod to me in having two very different textures on separated shell halves. The bottom half is very inflated and easily confused with Nervostrophia. Uncommon. Scattered prickly projective appear on the bottom half while the top part is concave and have many longitude ridges, making me thought it was a clam species.-
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- devonian
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From the album: Lime Creek Devonian Rockford Iowa
Cryptonella sp. Classic lamp brachiopod. Uncommon and easily overlooked due to its tiny size.-
- brachiopod
- cryptonella sp.
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From the album: Lime Creek Devonian Rockford Iowa
Strophonelloides sp. Rare - very distinct, resembles Rafinesquina from Ordovician. Fragile as heck too. Even this one in hard shale had cracks and is deformed.-
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- devonian
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From the album: Lime Creek Devonian Rockford Iowa
Tenticospirifer cyrtiniformis - a bit more common than Cyrtina iowaensis.-
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- devonian
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From the album: Lime Creek Devonian Rockford Iowa
Cyrtina iowaensis uncommon. Easily overlooked due to its tiny size. Only way to tell apart from Tenticospirfier is its coarser ribs.-
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- cyrtina
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From the album: Lime Creek Devonian Rockford Iowa
Nortonechinus primus a sea urchin - I suspects the spines is a bit more common than people thought but still rare. More overlooked due to its small size and resembles broken golf tees.-
- devonian
- echinoderm
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From the album: Lime Creek Devonian Rockford Iowa
Paracycias sabini Abundant in some areas - I suspects most folks overlooked them as looking like pebbles. Sources put the two distinct forms - one oval, the other flatter circular into one acceptable species. Shell is rarely preserved with the far most bottom one in the picture a good example -
From the album: Lime Creek Devonian Rockford Iowa
Pterinea husseyi - internal mold. Rare. This bivalve which is the only one I had found so far is related to winged oysters thus its weird shape. The winged part is the NW corner of the shell with its hinges NE part to give a general picture. -
From the album: Lime Creek Devonian Rockford Iowa
Side view of Pterinea husseyi showing hinge lines. -
From the album: Lime Creek Devonian Rockford Iowa
Stromatoporoid -
From the album: Lime Creek Devonian Rockford Iowa
Fenestella sp. A lace bryozoan - usually found in small pieces in the harder shale. -
From the album: Lime Creek Devonian Rockford Iowa
Crinoid stem fragments. I divided them into two groups based on differences in shapes of basic stems. But it look like both groups have come from the same family based on internal structures so far less variety in family tree for that section of Devonian but I'm guessing at least three species are represented in this photo. Uncommon. -
From the album: Lime Creek Devonian Rockford Iowa
Atrypa devoniana. Can be confused with two other genus species even thought it is low in diversity of shapes. Its shell is fragile, and more likely to be misshaped during the fossilization progress. Juvenile can be easily confused with Spinatrypa rockfordensis.-
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From the album: Lime Creek Devonian Rockford Iowa
Spinatrypa rockfordensis Highly variable in shapes, ranging from flat to moderately inflated, from nearly rectangular oval to circular. Juveniles often is less coarse. This species can be commonly confused with Atrypa devoniana-
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From the album: Lime Creek Devonian Rockford Iowa
Schizophoria iowensis Very inflated but shell is more fragile than it looks and tend to fall apart. One internal mold can be seen in far bottom left of picture. Juvenile looks very different and in some ways resembles certain Ordovician orthids - roughly rectangular oval and flatter with barely noticeable sulcus. Moderately variable in shape, usually at margins but a lot of shapes can be due to geography pressures during fossilization processes.-
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From the album: Lime Creek Devonian Rockford Iowa
Cyrtospirifer whitneyi - the most variable in shapes of all the brachiopod species at Lime Creek Formation. No one knows why its so variable as the only thing close to it is oysters, jewelboxes and such but they lives on hard substrates not on stalks on muddy bottom like spirifer brachiopods. One half may be nearly flat, or greatly inflated. Wings can be so extreme that it look more rectangular or may be absent. Sulcus may be greatly reduced in juvenile forms. Ribs can vary from fine to coarse.-
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- cyrtospirifer
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From the album: Lime Creek Devonian Rockford Iowa
Straparollus argutus seem to be the larger of the two species, also much more thicker in diameter when adult size. Common, maybe a bit less common than S. circinatus. -
From the album: Lime Creek Devonian Rockford Iowa
There are two similar species of Straparollus. Think of them like sundial snails. Straparollus circinatus seem to be the smaller of the two species and also the thinnest in diameter. Common. -
From the album: Lime Creek Devonian Rockford Iowa
Bellerophon sp. Abundant. Look a lot like rams horn snails.-
- bellerophon sp.
- devonian
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