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Showing results for tags 'mississippian'.
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From the album: MY FOSSIL Collection - Dpaul7
Large Archimedes Bryzoan in matrix Bangor Limestone Formation, North Alabama, USA Mississippian Period c 325,000,000 years ago Archimedes is a genus of bryozoans belonging to the family Fenestellidae. The first use of the term "Archimedes" in relation to this genus was in 1838. This genus of bryozoans is named Archimedes because of its corkscrew shape, in analogy to the Archimedes' screw, a type of water pump which inspired modern ship propellers. These forms are pretty common as fossils but they have been extinct since the Permian. Archimedes is a genus of fenestrate bryozoans with a calcified skeleton of a delicate spiral-shaped mesh that was thickened near the axis into a massive corkscrew-shaped central structure. The most common remains are fragments of the mesh that are detached from the central structure, and these may not be identified other than by association with the "corkscrews", that are fairly common. Specimens in which the mesh remains attached to the central structure are rare. Like other bryozoans, Archimedes forms colonies, and like other fenestrates, the individuals (or zooids) lived on one side of the mesh, and can be recognized for the two rows of equally distanced rimmed pores. Inside the branches, neighbouring individuals were in contact through small canals. Bryozoans are stationary epifaunal suspension feeders. The majority of fossils of this genus are distributed throughout Europe and North America, but they have also been found in sediments of Afghanistan, Canada, Russia, and Australia. Kingdom: Animalia Phylum: Bryozoa Class: Stenolaemata Order: †Fenestrida Family: †Fenestellidae Genus: †Archimedes-
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Strikingly preserved in an iron-rich hump on a grey limestone, one of the commonest Mississippian corals in the British Isles, France, Belgium, Germany and Russia. Not known from Asia, Africa, Australia or the Americas. Frequently found as an erratic on many parts of the British Isles coast. The simplest and narrowest Siphonodendron species (typically 2.5 - 3.8mm), easy to identify as it has no dissepiments. Central columella present in most corallites, with dome shaped or conical tabulae. Usually sixteen major septa. (14-18 possible) Minor septa may be present. The calcite filling in the voids is transparent and the specimen is varyingly coloured with presumed haematite, highlighting the structure visible below the surface.
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From the album: Collection
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From the album: Mississippian Redwall Limestone Fossils, Arizona
5x close up of the ambulacral feeding grooves. The ribs have tiny cross ribbing used to channel the flow of food to the animals mouth in the center, where the five point star is located.-
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From the album: Mississippian Redwall Limestone Fossils, Arizona
Large one inch sized Orophocrinus Saltensis Blastoid top half. You can just make out the ambulacral feeding grooves inside its five fold symmetrical body.-
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Syringopora sp. from the Redwall Limestone
Arizona Chris posted a gallery image in Member Collections
From the album: Mississippian Redwall Limestone Fossils, Arizona
Here is a nice cross cut example of Syringopora, the most common coral you will find in the Redwall Limestone, Mooney Falls member - On the Mogollon Rim north of Payson. This is a pink chert mold, and the orginal coral has dissolved away leaving very fine details in the chert. This is a fine example of a Tabulate coral, the animal resided in the tops of each tube in a calice, and filtered food out of the plankton.-
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Phillipsia peroccidens cranidium / glabella
Arizona Chris posted a gallery image in Member Collections
From the album: Mississippian Redwall Limestone Fossils, Arizona
Here you can see the both the upper and lower surfaces of this rare trilobites cranidium. There is much debate as to what the actual tubercles were used for - sensory, camouflage, or defense. This pair of fossils were found on the Mogollon Rim in northern Arizona near the town of Young. Arizona Chris -
Phillipsia peroccidens - Second cranidium / glabella
Arizona Chris posted a gallery image in Member Collections
From the album: Mississippian Redwall Limestone Fossils, Arizona
Another close up showing the tubercles at a better advantage. -
A rare genus from this bed, one previous record seen from Cumbria. It is common earlier in the Mississippian of the region. The voids are filled with transparent calcite. This genus has a lonsdaleoid outer dissepimentarium (looking like large bubbles). As is most commonly the case, it was largely removed prior to fossilisation, leaving a trace on one side (see photo 4). The contorted axial region is typical.
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One of the commonest Mississippian corals in the British Isles, France, Belgium, Germany and Russia. Not known from Asia, Africa, Australia or the Americas. Frequently found as an erratic on many parts of the British Isles coast. The simplest and narrowest Siphonodendron species (2.5 - 3.8mm), easy to identify as it has no dissepiments. Central columella present in most corallites, with dome shaped or conical tabulae. Usually sixteen major septa. (14-18 possible) Minor septa may be present. This specimen shows all these features very clearly, partly because the voids have been filled with transparent calcite.
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A few weeks ago, my sister and I collected a number of what we believe are coral specimens from the Hartselle Sandstone Formation of the Mississippian Period in northwest Alabama, near Russellville. They appeared to resemble some pictures of certain sponges and corals. However, after reading Juan Emnanuel's trip report on the Credit River in Mississauga, Ont., I saw some pics of coral he found, Favistella, which look very similar. So, I am posting the following pics for help in formally identifying those that we have. Thank you very much in advance. The first one, pics 1 and 2, is 5cm x 2.5cm in a hash matrix of bryozoan fronds and brachiopods. Quarter for scale, also. The second, pics 3 and 4, show the same pattern, 3.5cm x 3.5cm, in the lower, smaller area of the matrix stone and the crystallized cross section of the flat area of the fossil. The same type of bryozoan hash overlies much of this piece. In addition, these fossils are heavier than the other fossils (non coral) that we found that day, which makes me wonder if all the coral pieces are crystallized like pic 4 indicates.
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From the album: Mississippian Fossils from Northwest Arkansas
Platycrinites Crinoid Column Mississippian Found in Bentonville Ar© ssx
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From the album: Mississippian Fossils from Northwest Arkansas
Rugosa Horn Coral Mississippian Era Bentonville, Ar© ssx
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From the album: Mississippian Fossils from Northwest Arkansas
Rugosa Horn Coral Mississippian Era Bentonville, Ar© ssx
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From the album: Mississippian Fossils from Northwest Arkansas
Ulicrinus Crinoid Calyx Mississippian Bentonville, Arkansas© ssx
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From the album: Mississippian Fossils from Northwest Arkansas
Spirifer Brachiopod Mississippian Bentonville, Arkansas© ssx
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From the album: Mississippian Fossils from Northwest Arkansas
Spirifer Brachiopod Mississippian Bentonville, Arkansas© ssx
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From the album: Mississippian Fossils from Northwest Arkansas
Spirifer Brachiopod Mississippian Bentonville, Arkansas© ssx
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From the album: Mississippian Fossils from Northwest Arkansas
Crinoidea Mississippian Found in Bentonville, Arkansas© ssx
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From the album: Mississippian Fossils from Northwest Arkansas
Crinoidea Mississippian Found in Bentonville, Arkansas© ssx
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From the album: Mississippian Fossils from Northwest Arkansas
Crinoidea Mississippian Found in Bentonville, Arkansas© ssx
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Revisiting Spergen Hill, Indiana And Some Of Its Mississippian Micro-Fossils
dshamilla posted a topic in Micro-paleontology
This is my first "new topic" post to the FF, so I hope I'm doing this correctly. If you have a microscope or equivalent and a current or potential interest in micro-fossils, you might enjoy collecting at the following historic locality: Mississippian Salem Limestone, about 5 miles east of Salem, Indiana off Rt. 160; Spergen (Spurgeon) Hill, railroad cut (Manon RR) paralleling S. Harristown Rd, 0.75 mi north of Rt. 160; south end of Trackside Road; approximately 140 meters S of Harristown, Washington Co., Indiana; diminuitive fauna; Universal Transverse Mercator (UTM) coordinates: 16S 585024.04 4272332.25. My first introduction to micro-fossils was in a paleontology lab I took during the 70’s with the focus of study on the foraminiferid, Endothyra baileyi (now called Globoendothyra baileyi). These tiny specimens were labeled “Spergen Hill” on their container without further description. A few years later, I was able to locate the source of the specimens as the type locality for the Salem Limestone (formerly, Spergen or Spergen Hill Limestone) of Middle Mississippian or Meramecean (Valmeyerian) age. Sratigraphically, it sits above the Harrodsburg Limestone and beneath the St. Louis Limestone. The locality is a railroad cut at Spergen Hill, just south of Harristown, Washington County, Indiana. The cut is relatively narrow and much caution is advised upon the advent of trains entering the cut. The rock at this locality is a medium to coarse grained, tan to gray, crossbedded calcarenite containing mostly microfossils. Macrofossils (somewhat sparse) are present in the formation but nowhere near the quantity of the microfossils (G. baileyi has been estimated at 1,000 / in3 in some portions of the strata). Besides single-celled eukaryotes (e.g., Globoendothyra), representatives of most of the major phyla are present in diminuitive form or as tiny fragments of the macro fauna (spines, plates, columnals, etc.) I’ve visited the location at least three times in the past and besides collecting macrofossils on these visits, I have also accumulated a quantity of the rock containing the microfossils. On arriving home, I pulverize the collected rock with a sledge to a fine granular size and wash and strain the residue through a porous cloth to remove any extra fine material (rock dust) The washed residue is then dried and placed in labeled plastic bags. Then, in the dead of winter when collecting is not possible for me and the “urge” to collect is compelling, I drag out a bag, place some of the residue in a shallow container under my scope and go fossil collecting and identifying! I use a very fine-pointed forceps, which I periodically ground to a piece of rubber (to avoid static electricity buildup) to pick out fossils from the residue. I find it a bit better for collecting the micros from this locality than using a wetted fine paintbrush. This location has been estimated to contain over 100 species of invertebrates on a micro level. More information can be found at http://www.fallsoftheohio.org/SalemMicrofossils.html. The attached photos were taken for a program I was giving on Indiana fossils to illustrate single-celled eukaryotes (Protozoa). The first photo shows a random selection of micro-specimens of various phyla collected from the residue with an emphasis on the G. baileyi. The second and third show sorted G. baileyi specimens and G. baileyi specimens with matrix, respectively. Two free texts with plates are available on some of the Spergen Hill microfauna at the following websites: Whitfield, R.P. On the fauna of the Lower Carboniferous limestones of Spergen Hill, Ind., with a revision of the descriptions of its fossils hitherto published, and illustrations of the species from the original type series. Bulletin of the AMNH; v. 1, article 5. (free download) https://books.google.com/books?id=ebYPAAAAIAAJ&pg=PA241&lpg=PA241&dq=whitfield,+R.P.+On+the+fauna+of+the+limestones+of+Spergen+Hill&source=bl&ots=iFhHvpc7qf&sig=XNpUBo45hKPRICv5fLdb0AlJktA&hl=en&sa=X&ei=pO8_Ve70G-vlsATq-4EQ&ved=0CCQQ6AEwAg Cumings, E.R. et al. Fauna of the Salem Limestone of Indiana. (free download). https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0CB4QFjAA&url=https%3A%2F%2Fscholarworks.iu.edu%2Fdspace%2Fhandle%2F2022%2F12889&ei=G_o_Va3_CveasQSCu4HADA&usg=AFQjCNGsTNbr2RKBBebd6bnuISOcqvMsPw- 9 replies
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