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Found 5 results

  1. What is this? Receptaculites?

    I found this in a field hunting fossil wood. Back in 2006. : Field of view about 10mm. The pinched end of what I had assumed to be some sort of coral. Helena, Texas. The end view is ground smooth & shows 2mm circular whirls. With spiraling partitions. Almost impossible to photograph. I can only see one clearly with 10X. This fossil may be a negative cast? As the crust of the stone spalled. Anyhow- with nothing to compare. I have decided to put money on Receptaculites.......-=James
  2. I only recently got into collecting after being out hiking and literally tripping over a large coral fossil a couple years ago and the hunt has been on since! SO much to learn! I wish I'd have started 30 or 40 years ago. I haven't posted any of my finds as I've been trying learn a little first and see if I could identify some of these. I think I've got some of them and others I haven't found a name for, so I hope you don't mind me dumping several on you. Are all these Receptaculites Oweni? They were found in the Galena dolomite in the Dubuque area in what I think is the Fairplay member of the Dunleith. (30 or 40 feet above river level) The third photo of the slightly smaller one was found in a drainage ravine so I can't be sure the layer it came from, but I don't believe it had been carried very far if at all. It was 30 or 40 feet higher than the other two. Is the last one Ischadites Iowensis or another Oweni? Is there a good guide to these somewhere? These next are of a nautiloid I haven't found the name for. This was found in the Guttenburg member of the Decorah also in the Dubuque area near river level. It was in the outcrop about a foot above the top of what I think is the Spechts Ferry member. I also found quite a few Rafinesquina brachiopods laying around in the talus and the pygidiums of a couple different trilobite. I think one is Gabricerarus Mifflenensis and the other Isotelus? It looks a lot like the ones in the last photos of what I'm pretty sure are some Isotelus Iowensis I found near Elgin, IA). Are these Isotelus Iowensis? These were found near Elgin, IA in what I think is the Elgin member of the Maquoketa. About a foot above the Turkey river that day. You can actually make out what I assume are compound eyes? Being kind of new to this I'm amazed at the detail you can still see in some of these for something so old. I haven't found the name of these cephalopods yet either. They were found the same day and not far from the trilobites in Elgin and about 5 or 6 feet higher in the rock layer.
  3. Receptaculites Oweni.jpg

    From the album Fayette County Iowa

  4. Receptaculites a.jpg

    From the album MY FOSSIL Collection - Dpaul7

    Receptaculites SITE LOCATION: Decorah, Iowa, USA TIME PERIOD: Ordovician Period (445-485 Million Years ago) Data: Receptaculites is the name-bearing genus for an extinct group of conspicuous benthic marine genera, the Receptaculitidae, that lived from the Early Ordovician through the Permian period, peaking in the Middle Ordovician. The group's phylogenetic origin has long been obscure, but the current understanding is that the Receptaculitidae were calcareous algae, probably of the Order Dasycladales. Receptaculitids lived in warm, shallow seas and have been described from all continents except Antarctica. In some areas they were important reef-formers, and they also occur as isolated specimens. Receptaculites and its relatives have a double-spiral, radiating pattern of rhombus-shaped plates supported by spindle-like objects called meroms. Fossils can usually be identified by the intersecting patterns of clockwise and counterclockwise rows of plates or stalk spaces, superficially similar to the arrangement of disk florets on a sunflower -- hence the common name "sunflower coral" Kingdom: Plantae Phylum: Chlorophyta Class: Chlorophyceae Order: Dasycladales Family: †Receptaculitidae Genus: †Receptaculites
  5. Receptaculites a.jpg

    From the album MY FOSSIL Collection - Dpaul7

    Receptaculites SITE LOCATION: Decorah, Iowa, USA TIME PERIOD: Ordovician Period (445-485 Million Years ago) Data: Receptaculites is the name-bearing genus for an extinct group of conspicuous benthic marine genera, the Receptaculitidae, that lived from the Early Ordovician through the Permian period, peaking in the Middle Ordovician. The group's phylogenetic origin has long been obscure, but the current understanding is that the Receptaculitidae were calcareous algae, probably of the Order Dasycladales. Receptaculitids lived in warm, shallow seas and have been described from all continents except Antarctica. In some areas they were important reef-formers, and they also occur as isolated specimens. Receptaculites and its relatives have a double-spiral, radiating pattern of rhombus-shaped plates supported by spindle-like objects called meroms. Fossils can usually be identified by the intersecting patterns of clockwise and counterclockwise rows of plates or stalk spaces, superficially similar to the arrangement of disk florets on a sunflower -- hence the common name "sunflower coral" Kingdom: Plantae Phylum: Chlorophyta Class: Chlorophyceae Order: Dasycladales Family: †Receptaculitidae Genus: †Receptaculites
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