The use of microphytoplankton and chitinozoans for interpreting transgressive/regressive cycles in the Rapid Member of the Cedar Valley Formation (Middle Devonian), Iowa

Organic-walled microphytoplankton assemblage of the Middle Devonian (Givetian) Arkona, Hungry Hollow and Widder formations, Ontario, Canada: biostratigraphic and palaeogeographic significance

“…Cymatiosphaera cornifera Deunff, 1955 has been recorded from the Middle Devonian-Frasnian, Ontario (Deunff 1955(Deunff , 1967; late Pragian-middle Givetian, Ontario ; Givetian, Ohio (Wicander and Wood 1981); Middle Devonian, Ohio (Wicander and Wright 1983); Pragian, northern Bolivia (Vavrdová et al 1996); late Givetian -early Frasnian, Boulonnais, France (Deunff 1981); Eifelian, China (Zhu Huaicheng et al 2008); and Tournaisian/Tn1b, Xizang/Tibet (Gao Lianda 1986). Stockmans and Willière (1969) figured a putative example of C. cornifera from the early Famennian of Belgium, but a positive attribution is considered questionable (Deunff 1967); Emsian-middle Eifelian and early-middle Givetian, Ontario ; Givetian, Ohio and Kentucky (Wicander and Wood 1981;Wood and Clendening 1985); late Givetian, Iowa (Wicander and Wood 1997); and Givetian, western Libya (Moreau-Benoit 1984).…”

“…8 1973 Dictyotidium dictyotum Legault,p. 52 (pars) ; late Pragian-middle Givetian, Ontario ; Lochkovian, Oklahoma (Wicander 1986); Givetian, Ohio and Kentucky (Wicander and Wood 1981;Wood and Clendening 1985); late Givetian, Iowa (Wicander and Wood 1997); Middle Devonian, Ohio (Wicander and Wright 1983); and Tournaisian/Tn1b, Xizang/Tibet (Gao Lianda 1986).…”

“…Previous records. Duvernaysphaera tenuicingulata Staplin, 1961 occurs in the late Emsian, late Eifelian and early-middle Givetian, Ontario ; Late Devonian, Alberta (Staplin 1961); Givetian, Ohio and Kentucky (Wicander and Wood 1981;Wood and Clendening 1985); late Givetian, Iowa (Wicander and Wood 1997); Middle Devonian, Ohio (Wicander and Wright 1983); late Givetian-early Frasnian, Argentina ( Barreda 1986;; early Frasnian, Boulonnais, France (Deunff 1981); undifferentiated Devonian, Tunisia ; late Famennian, Portugal (Pereira et al 2008); Givetian-Famennian, Algerian Sahara (Jardiné et al 1974); and Frasnian, Western Australia (Playford and Dring 1981).…”

A Mineralized Alga and Acritarch Dominated Microbiota from the Tully Formation (Givetian) of Pennsylvania, USA

“…However, no Solisphaeridium material has yet been reported from the Middle Devonian of New York or Pennsylvania. Figures 1 and 2); [102] (Plate 6, Figures 1 and 2); the Middle Devonian S. laevigatus [103] (Plate III, Figures 2 and 3); the Cambro-Ordovician S. akrochordum [99] (Plate 13, Figures 1-6); and the Jurassic S. brevispinosus [104] (Plate 2, Figure 8). In addition, there is evidence that the cavity inside the spines opens directly into the vesicle interior.…”

Palynology and Microfacies of Lower Devonian Mixed Carbonate-Siliciclastic Deposits in Podolia, Ukraine

“…However, biostratigraphic subdivision of the sedimentary successions remains unsatisfactory, especially of those strata deposited during the late Lochkovian, when conditions changed from marginal marine to alluvial (Uchman et al 2004;Małkowski et al 2009;Drygant 2010;Voichyshyn 2011). Palynological studies have proven useful for subdi− viding and correlating various sedimentary facies, as well as can also assist in interpreting changes in sedimentary envi− ronments (e.g., Tyson 1993;Batten 1996;Wicander and Wood 1997;Filipiak 2002;Filipiak and Zatoń 2011). In Podolia, such integrative palynological analyses are espe− cially needed (Le Hérissé et al 1997) to decipher the evolu− tion of sedimentary conditions during this regressive Early Devonian interval, supplementing the sedimentological−eco− logical data provided by Uchman et al (2004).…”