Stratigraphic Resolution and Perceptions of Cycle Architecture: Variations in Meter‐Scale Cyclicity in the Type Cincinnatian Series

1997 ◽  
Vol 105 (6) ◽  
pp. 737-743 ◽  
Author(s):  
Arnold I. Miller ◽  
Steven M. Holland ◽  
Benjamin F. Dattilo ◽  
David L. Meyer
Keyword(s):  
Cincinnatian Series

scholarly journals Paleoecology of Cyclocrinites darwini (Miller) - a cyclocrinitid alga from the Cincinnatian series (Upper Ordovician)

1992 ◽  
Vol 6 ◽  
pp. 177-177
Author(s):  
Peter B. Lask
Keyword(s):  
Structural Similarity ◽  
High Energy ◽  
Energy Conditions ◽  
Upper Ordovician ◽  
Third Order ◽  
Coral Rubble ◽  
Lake Formation ◽  
Lateral Branches ◽  
Key Largo ◽  
Cincinnatian Series

Cyclocrinitids are considered to be calcareous green algae closely related to, or members of, the dasycladacean algae. Cyclocrinitids are characterized by a globular thallus 1-5 cm in diameter consisting of whorls of calcified meromes borne from a tubular or spherical central axis. The species Cyclocrinites darwini is distinguished from other cyclocrinitids by the presence of lateral branches arranged in a stellate pattern at the distal end of each merome.C. darwini is restricted to strata of the Cincinnatian Series. Specimens are commonly found in shale-filled channels cutting through nodular, irregularly-bedded limestones within the Mt. Auburn Formation and the lower Sunset Member of the Arnheim Formation. Numerous specimens are also known from the Bellevue Member of the Grant Lake Formation at Maysville, Kentucky. Each of these units has been interpreted to be the top of separate shoaling-upward, third-order cycles. These facies are abundantly fossiliferous, often consisting of broken, abraded, and reworked material.The modern dasyclad Neomeris is cited for its structural similarity to the cyclocrinitids and ecological parallels have been postulated as well. Neomeris and a similar dasyclad Batophora, thrive while attached to pieces of coral rubble at depths of less than 3 m in the high-energy conditions associated with a reef crest environment at Key Largo, Florida.It is likely that C. darwini lived under similar conditions, attached to rubble in shoaling areas. Preservation only occurred in instances when thalli were broken off from their holdfasts and swept into ripple troughs or downslope channels cutting across the shoals. It has been suggested that the presence of cyclocrinitids is indicative of relatively quiet environments below wave base. For Cyclocrinites darwini, the opposite would appear to be the case.

Resistance to and repair of shell breakage induced by durophages in Late Ordovician brachiopods

1986 ◽  
Vol 60 (2) ◽  
pp. 273-285 ◽  
Author(s):  
Richard R. Alexander
Keyword(s):  
Selective Pressure ◽  
Late Ordovician ◽  
Frequency Distributions ◽  
Striking Resemblance ◽  
Progressive Development ◽  
Size Frequency ◽  
Shell Repair ◽  
Cincinnatian Series ◽  
State Area ◽  
Size Refuge

Repaired shell breakage in Late Ordovician brachiopods from the Cincinnatian Series in the tri-state area of Indiana-Kentucky-Ohio may be described in increasing order of severity as scalloped, divoted, cleft and embayed. Concavo-convex brachiopod taxa display disproportionately higher frequencies of shell repair assigned to each category, whereas inflated, biconvex, plicate, sulcate taxa display disproportionately lower frequencies of shell repair. Certain plicate biconvex taxa lack examples of cleft and embayed valves. Plano-convex and dorsi-biconvex, costate taxa showed intermediate frequencies of shell repair, but lack representatives of embayed valves. Selective pressure for evolution of morphologic characters resistant to shell breakage may have favored phyletic trends of increasing size, geniculation and progressive development of a commissural ridge around the lophophore platform of the interior of the concave brachial valve of Leptaena and Rafinesquina. Size-frequency distributions for repaired and undamaged valves provide equivocal evidence of a size refuge from predator-induced shell breakage in Rafinesquina. Among the contemporaneous, potentially durophagous predators, nautiloids probably inflicted the sublethal injuries sustained by the brachiopods. The incriminating evidence includes a fragment of a crushing element imbedded in a valve of Rafinesquina that bears a very striking resemblance to calcified rhyncholites of Mesozoic to Recent nautiloids.

Trans-Pacific graptolite faunal relations: the biostratigraphic position of the base of the Cincinnatian Series (Upper Ordovician) in the standard Australian graptolite zone succession

1990 ◽  
Vol 64 (6) ◽  
pp. 992-997 ◽  
Author(s):  
Stig M. Bergström ◽  
Charles E. Mitchell
Keyword(s):  
New York ◽  
Close Correlation ◽  
Late Ordovician ◽  
Upper Ordovician ◽  
Important Species ◽  
Type Area ◽  
Cincinnatian Series ◽  
Early Late ◽  
Drill Cores

Recent studies of drill-cores and outcrops have resulted in the discovery of previously unknown, taxonomically diverse, graptolite faunas in the late Middle (Mohawkian) and early Late Ordovician (Cincinnatian) strata in the Cincinnati region, the type area of the Cincinnatian Series. These faunas contain several zonal indices and other biostratigraphically important species that are used for close correlation with the standard graptolite zone succession in New York and Quebec. The new data show that the base of the Cincinnatian Series in its type area is near the middle of the Climacograptus (Diplacanthograptus) spiniferus Zone. Significantly, about a dozen Cincinnati region graptolite species are shared with apparently coeval strata in the standard Australian graptolite zone succession in Victoria, and this key faunal evidence indicates that the base of the typical Cincinnatian corresponds to a level near the middle of the Climacograptus (Climacograptus) baragwanathi Zone (Ea2) of the Eastonian Stage. This represents a considerable revision of some recently published correlations of the basal Cincinnatian in terms of the Australian graptolite zone succession.

THE "CURSE OF RAFINESQUINA:" NEGATIVE TAPHONOMIC FEEDBACK EXERTED BY STROPHOMENID SHELLS ON STORM-BURIED LINGULIDS IN THE CINCINNATIAN SERIES (KATIAN, ORDOVICIAN) OF OHIO

Palaios ◽  
2013 ◽  
Vol 28 (6) ◽  
pp. 359-372 ◽  
Author(s):  
R. L. FREEMAN ◽  
B. F. DATTILO ◽  
A. MORSE ◽  
M. BLAIR ◽  
S. FELTON ◽  
...  
Keyword(s):  
Cincinnatian Series
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