Ausich et al.—Fort Payne Formation Batocrinidae
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Cave Springs North, Cave Springs South, Gross Creek, and Gross Creek West; wackestone buildup facies at Bugwood, Harmon Creek, Lily Creek, Owens Branch, Pleasant Hill; sheetlike packstone facies at Cove Creek, Obey Creek, Seventy-Six Falls, Wolf Creek/Caney Fork Confluence, 61B, 61D, and 61DW, 61N, and 61RS; and the autochthonous green shale facies at Blacks Ferry and Celina. Old localities lacking precise coordinates include Glasgow and Metcalf counties, Kentucky, Eagle Mill near Livingston, and at Browns Ford, in Tennessee.
Description.—Calyx flat cone (Fig. 6.2) or flat bowl shaped (Fig. 6.1), widest at level of arm openings, shallow basal concavity entirely within basal circlet or including as much as one-half of radial circlet; calyx plates flat to gently convex. Outline of calyx at level of arm openings variable, either subcircular, slightly indented interradially or moderately indented interradially. Basal circlet part of basal concavity; basals three, equal
in size, wider than high (Fig. 6.3). Radials five, twice as wide as high, hexagonal. Regular interrays with one to three plates, typically one; commonly first interradial somewhat higher than wide, not in contact with tegmen but in sutural contact on both sides above with the first secundibrachial (which is axillary) and the first tertibrachial, rarely first interradial approximately two and one-half times higher than wide and in contact with tegmen. Primanal heptagonal, as wide as high, slightly higher and
conspicuously narrower than radial plates; three plates in second range, medial plate at least twice as high as wide, in contact with tegmen, and in contact with plate above at approximately the level of arm opening with an oblique suture; two lateral plates of second range variable, either as high as wide or higher than wide.
between individuals, either two normal primibrachials (first quadrangular, second axillary), two primibrachials with the first not full width of ray, or the first primibrachial axillary. Arm openings in secundibrachials or tertibrachitaxis; arm openings large, vertical or inclined slightly upward. Tegmen low inverted cone from arm openings to base of
Primibrachitaxis variable within an individual and
Figure 6. Alloprosallocrinus conicus from the Fort Payne Formation: (1) DE-interray lateral view of a specimen with a slightly convex calyx and broadly convex tegmen plates (USNM 639907); (2) CD-interray lateral view of a specimen with a flat calyx and more sharply nodose tegmen plates (USNM 639909); (3) basal view of a calyx with plate sutures visible due to weathering (USNM 639908). Scale bar, as indicated.
in Dekalb (Krivicich et al., 2013, Locality 1), Limestone (Krivicich et al., 2013, Locality 3), and Madison (Krivicich et al., 2013, Locality 2) counties. In Indiana, Alloprosallocrinus conicus is from the Edwardsville Formation at the Crawfordsville lower quarry, Indian Creek, and Walnut Fork in Montgomery County and at Allens Creek Bank,Monroe County. In the Fort Payne Formation of south-central Kentucky and
north-central Tennessee, Alloprosallocrinus conicus is known from the following facies: crinoidal packstone buildup facies at
anal tube, symmetrical or asymmetrical; plates convex or spinose. Anal tube central to subcentral, high. One thecal pore on either side of arm openings (Fig. 6.1, 6.2). Free arms 10–12; robust, aborally rounded, and relatively
wide and deep.
Materials.—Numerous specimens of A. conicus are present at the U.S. National Museum of Natural History, the Field Museumof Natural History, and at Indiana University. The type suite of A. conicus from Clear Creek, Hardin County, Kentucky (USNM S 783) includes four specimens. A lectotype is desig- nated as USNM S 783a, and paratypes are USNMS 783b–d. A specimen from Troost’s work is USNM 39923 (Conocrinites Leæ), but the specimen for Conocrinites tuberculosus is missing (Wood, 1909). Type specimens from other junior synonyms include the cotypes of A. depressus (USNM S 1062) and the holotype of Alloprosallocrinus gurleyi (FMNH UC 6275). The following are new Fort Payne Formation specimens from this
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