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020 (1 of 4)
Beautiful day out on the quarry slopes.
October 2, 2006 ...
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| 021 (2 of 4)
... the lower half to two thirds of the Cerro Gordo Member of the Upper Devonian (Frasnian) Lime Creek Formation of North-Central Iowa is exposed at Rockford, Iowa in Floyd County ...
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| 022 (3 of 4)
... the Cerro Gordo consists of extremely fossiliferous calcareous shales, nodular shaley limestones, and bedded argillaceous limestone ...
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| 023 (4 of 4)
... following a full day of collecting fossils, I left for Iowa City to collect research materials from the University of Iowa Geology Department and the Iowa Geological Survey ...
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| 024
... Rockford, Iowa; Established in 1858; Home of the Fossil & Prairie Park since 1979
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025rev
Collection was limited to surface picking of specimens focusing on a good sampling of as many brachiopod species as possible plus representative specimens of other orders. Limited to south and east slopes of the southeast section of the quarry area. Image is first layout back in ArcheoPaleo of 565 washed specimens including brachiopods, molluscs, 'fish', bryozoans, echinoderms, cnidarians and poriferans. Now they need sorting and species names! Then I will comingle them with the specimens I have previously collected (but put off 'specifying') at Rockford over the last 13 years...A good winter project (the ground is frozen anyway!). In the middle photo, in the lwr rt corner of it, there is a brown/white fossil between the Placyphyllum and the large Strophonelloides, a VERY INTERESTING new 'FISH' fossil!!!
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| 036rev
Final sort of all 400 brachiopods from this field trip. Cerro Gordo brachiopods have been collected and studied since 1858. I am relying on Jed Day (U of Illinois) for current generic names (36 articulate brachiopod species in the entire Cerro Gordo Member - how many at Rockford? - so far I've found 20 of his plus 10 possible others not listed); and for images and descriptions (and locales) have so far retrieved a dozen recent papers plus the old books of the Fentons(1924, 1935, 1918, 1919), Stainbrook(1945), Calvin(1883 and undated 'plate book'), Belanski(1928), Webster(1921), Cooper(1973) plus Shimer/Shrock(1944) and Shrock/Twenhofer(1953), etc.
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| 031rev
ATRYPIDA
Pseudoatrypa devoniana
Spinatrypa rockfordensis
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| 030rev
This is a prelim sort:
ORTHIDA
Scizophoria iowensis
(for middle and bottom trays see later images)
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| 035rev
TEREBRATULIDA
Cranaena navicella
SPIRIFERIDA
Spirifer whitneyi
(S. whitneyi owenensis)
(Pyramidaspirifer alta)
Riguaxia orestes
Conispirifer (tenticospirifer) cyrtinaformis
Platyrachella macbridei
STROPHOMENIDA
Floweria prava
Devonoproductus walcotti
...plus 1 unknown
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028
first attempt at larger-size STROPHOMENIDA
Note: the Fentons did a lot of species 'variation' describing which helped sorting the Strophomenida (see next images). However Day doesn't recognize many of the ones I matched - need to give them another once-over...
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| 032rev
refined sort of large-size STROPHOMENIDA
Strophonelloides reversa
(S. reversa triangularis)
(S. reversa alta)
(S. reversa lata)
Strophonella hybrida ??
(S. hybrida ponderosa)
(S. hybrida quadrata)
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| 033rev
... more large-size STROPHOMENIDA
Nervostrophia canace
N. rockfordensis
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| 029rev
smaller-size STROPHOMENIDA first sort against text and image from Stainbrook(1945) and Fentons(1924)
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| 034rev
refined sort of same grouping of STROPHOMENIDA
Douvillina navicula
D. sp
D. arcuata
D. delicata
Sulcatostrophia camerata
S. calvini
Strophodonta thomasi
Need to do this all over again!!!
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