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Showing results for tags 'iowa'.
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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. -
From the album: Lime Creek Devonian Rockford Iowa
Tenticospirifer cyrtiniformis - a bit more common than Cyrtina iowaensis. -
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. -
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. -
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. -
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 -
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. -
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. -
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. -
From the album: Lime Creek Devonian Rockford Iowa
Diaphorostoma antiquum Rare - very very distinct shapes, more like the freshwater nerites you find in pet stores. Only found one so far! There's some other smaller gastropods I hadn't identified yet. -
From the album: Lime Creek Devonian Rockford Iowa
Lioclema occidens common. One weird thing about Lime Creek Formation is the numbers of bryozoan species which was much more diverse in Ordovician become much more less diverse even thought similar environment - muddy subtropical seas. This is the largest rugose bryozoan left. All the others (so far not identified yet) are much smaller, less than .2 of a centimeter in diameter. -
From the album: Lime Creek Devonian Rockford Iowa
For now I'm just generally identify as Homalophyllum. And some people said they have trouble finding horn corals but for some reason as this massive pile shows, they're easy for me! SW corner are some largest and smaller specimens. The larger ones are easier to find and thus are the rarer while one inches and less seem to be the hardest for people to find. -
From the album: Lime Creek Devonian Rockford Iowa
The one on the right is positive identify as Gomphoceras floydensis. Rare. Middle is more of a single segment and the right one is a different species, currently unidentified. Seem like cephalopods from Rockford Iowa are on the small side and low diversity of species. Hadn't found one trilobite at all so far sigh. -
From the album: Lime Creek Devonian Rockford Iowa
Floydia gigantea. Much more common than Westerna gigantea. Whorls greatly enlarges in size and tend to be more oval shaped and flattened. Strongly resembles some modern top shells. There's a few other giant gastropods but I still need to check more in the near future. I was surprised seeing this good sized well preserved specimen in the middle sitting out in the open. -
From the album: Lime Creek Devonian Rockford Iowa
Naticopsis depressa Rare. Tightly whorled, like a giant bellerophon species. -
From the album: Lime Creek Devonian Rockford Iowa
Bensbergia pulchra Rare - only had found two so far. Very distinct whorls, more like some modern gastropods like tulip snails. -
From the album: Lime Creek Devonian Rockford Iowa
Aulopora sp. Chain coral most commonly found encrusting the apex of giant gastropod shells but can break loose and pile up on the muddy bottom on occasion. Tie with Phillipsastrea woodmani as most common colonial coral for rockford.
