(1993), and Gomez-Fernandez and Melendez (1994b), corresponds to Cycles IIC and IID proposed by Salomon (1982a; 1982b), and Cyclothem
II by Guiraud and Seguret (1985) (Fig.
The sedimentary succession of the middle portion of Cyclothem
14 is illustrated in Figure 3 (after Falcon-Lang 2006).
Each complete unit in the rock succession is known as a cyclothem
. Measured from the base of one limestone to the base of the next, each cyclothem
represents a few million years of geological time, in which depositional conditions changed from the warm clear-water marine conditions in which the limestones formed, to the more turbid deltaic and lagoonal environments in which the sandstones and shales were deposited.
(1996): Paleontology of the Greenhorn Cyclothem
(Cretaceous, Late Cenomanian to Middle Turonian) at Black Mesa, Northeastern Arizona.
Consequently, marine and nonmarine beds alternate and interfinger to form a pattern of transgressive and regressive rock deposition, which is commonly referred to as the classic Pennsylvanian cyclothem
As such, this sequence is part of a cyclothem
(Gibling and Bird 1994) in a terrestrial environment of an extensive costal platform (Wightman et al.
Diagenetic Model for Carbonate Rocks in Mid-Continent Pennsylvanian Eustatic Cyclothems
. AAPG Bulletin, 66(5), 580-580.
Trace-element behavior and redox facies in core shales of Upper Pennsylvanian Kansas-type cyclothems
1 Percentage of clastic rocks in cyclothems
of Upper Carboniferous in USCB: CSS--Cracow Sandstone Series; MS--Mudstone Series; USSS--Upper Silesian Sandstone Series; PS--Paralic Series conglomerate sandstone CSS 3 81 MS 27 USSS 2 53 PS 47 Note: Table made from bar graph.
Trace element behavior and redox facies in core shales of Upper Pennsylvanian Kansas-type cyclothems
. Chemical Geology, 206, 289-318.
Earlier studies recorded a braided-meandering fluvial depositional system with peat-forming mires in the low-lying marshy floodplains that produced thick succession of sandstone-shale-coal cyclothems
within the Barakar Formation .
Trace-element behaviour and redox facies in core shales of Upper Pennsylvanian Kansas-type cyclothems
. Chemical Geology 206, 289-318.