Impact of Longer-Term Modest Climate Shifts on Architecture of High-Frequency Sequences (Cyclothems), Pennsylvanian of Midcontinent U.S.A.

Feldman, Howard R.; Franseen, Evan K.; Joeckel, R.M.; Heckel, Philip H.

doi:10.2110/jsr.2005.028

Cited by 101 publications

(116 citation statements)

References 53 publications

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“…During any such individual cycle, climate also changes systematically (Cecil et al 1985(Cecil et al , 2003bTandon and Gibling 1994;Olszewski and Patzkowsky 2003;Falcon-Lang 2004;Feldman et al 2005;DiMichele et al 2009a;Horton et al 2012), strongly covarying with sea level changes. Within the pages of the articles cited above and others, however, the reader will find disagreement regarding the sea level position of key climate indicators, particularly paleosols (seasonally dry) and especially coals (wet with minimal seasonality): the principal points of contention regarding coals are that they formed during lowstand, during sea level rise and transgression, or at highstand, thus covering nearly all of the possibilities.…”

Section: Drivers Of Cyclic Sedimentation Patternsmentioning

confidence: 99%

“…4, 5) mark surfaces of nondeposition or limited deposition. They have characteristics that indicate climatic seasonality of varying degrees (Joeckel 1995(Joeckel , 1999Feldman et al 2005;Catena and Hembree 2012;Rosenau et al 2013aRosenau et al , 2013b. These empirical observations also suggest seasonally dry climates during the falling stages of sea level and during the early phases of lowstand ( fig.…”

Section: Tropical Cyclothems and Climate Cyclesmentioning

confidence: 99%

“…The parautochthonous deposits often represent small, channel-form accumulations in cratonic flatland settings (Cunningham et al 1993;Feldman et al 2005;Falcon-Lang et al 2009), with evidence from associated paleosols and sedimentary features of seasonal moisture regimes. The allochthonous deposits often occur as large accumulations of trunks in channel deposits, not infrequently as logjams (Calder 1998;FalconLang and Scott 2000;Stanesco et al 2002;Falcon-Lang 2003b;Gibling et al 2010).…”

Section: Dryland Floral Compositionmentioning

confidence: 99%

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Wetland-Dryland Vegetational Dynamics in the Pennsylvanian Ice Age Tropics

DiMichele¹

2014

International Journal of Plant Sciences

161

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Premise of research. The Late Paleozoic Ice Age was the last extensive pre-Pleistocene ice age. It includes many climate changes of different intensities, permitting examination of many and varied biotic responses. The tropical Pennsylvanian Subperiod, usually visualized as one vast wetland coal forest, in fact also was dominated, periodically, by seasonally dry vegetation that, in turn, covered most of the central and western Pangean supercontinent. Equatorial wetland and dryland biomes oscillated during single glacial-interglacial cycles. This recognition changes understanding of the Coal Age tropics; examination of their spatiotemporal patterns indicates that these vegetation types responded differently to global environmental disturbances and long-term trends and points to potentially different underlying controls on evolutionary histories of their component lineages.Methodology. This study is based on the published literature and on examination of geological exposures and fossil floras, mainly from North America but also from other parts of the world.Pivotal results. Wetlands and seasonally dry habitats were equally part of the Coal Age Pangean tropics. They dominated these landscapes at different times, under different climatic regimes. Wetland vegetation was likely forced into refugia during seasonally dry (subhumid to semiarid) parts of glacial-interglacial cycles; it reemerged/reassembled during wet (humid to perhumid) periods. Seasonally dry vegetation resided permanently in areas of western and central Pangea and in microhabitats within the Central Pangean Mountains. Both floras had lower biodiversity than modern floras in similar habitats. The wetland flora species pool was more phylogenetically disparate than any modern vegetation. In contrast, seasonally dry floras were dominated by seed plants. These biomes responded differently to acute environmental changes and chronic long-term aridification.Conclusions. From ecological or evolutionary perspectives, the present-day world is but one possibility. Lower-diversity worlds such as the late Paleozoic, with a rich spectrum of environmental variations, offer insights into relationships between organisms and environments that expand understanding of these phenomena and enlarge our sense of what is possible or probable as we look to the future.

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Section: Drivers Of Cyclic Sedimentation Patternsmentioning

confidence: 99%

Section: Tropical Cyclothems and Climate Cyclesmentioning

confidence: 99%

Section: Dryland Floral Compositionmentioning

confidence: 99%

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Wetland-Dryland Vegetational Dynamics in the Pennsylvanian Ice Age Tropics

DiMichele¹

2014

International Journal of Plant Sciences

161

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“…Whereas peltasperms in general spread widely throughout Pangean tropical and northern temperate latitudes (see discussion in Naugolnykh and Kerp, 1996), the callipterids formed prominent elements mainly in Permian tropical floras. The near absence of these plants from typical Late Pennsylvanian wetland floras and their occurrences in deposits with or associated with indicators of seasonality (e.g., Feldman et al, 2005), are strong evidence of their preference for seasonally dry settings.…”

Section: Introductionmentioning

confidence: 99%

Callipterid peltasperms of the Dunkard Group, Central Appalachian Basin

DiMichele

Kerp

Sirmons

et al. 2013

International Journal of Coal Geology

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“…(3) Not Associated with coals: Facies not associated with coals, comprising a variety of habitat conditions from permanently waterlogged but localized to seasonally dry habitats. Most of these formed under seasonally dry climatic regimes unfavorable to the accumulation of peat, such as channel-fill sediments formed contemporaneously with seasonally dry paleosols, and encompass a diverse array of plants varying greatly among the deposits (e.g., Leary, 1981;Feldman et al, 2005). Some of these come from sequences of floodplain or coastal plain deposits in which conditions were unfavorable for peat formation even if the landscape or local depositional environment was periodically quite wet, such as deposits capturing plants that grew within channel belts in what may have been, overall, seasonally dry environments (e.g., DiMichele et al, 2010).…”

Section: Facies Contextmentioning

confidence: 99%