North American Species of the Cretaceous Megaspores Balmeisporites and Monophyllosporites

Palynostratigraphy of the Tullock Member (lower Paleocene) of the Fort Union Formation in the Powder River basin, Montana and Wyoming

“…He therefore reassigned both Norton and Hall's and Kondinskaya's specimens to a new nomenclatural combination, Styx bella (Kondinskaya) Srivastava. He noted that the size range within this species was great, the diameter of the spores ranging from 50 to 200 j..lm not including acrolamellae. Bergad (1973) Despite the confusion that abounded over the correct name for these distinctive spores in the early 1970's, Leffingwell (1970) assigned specimens that he found in the basal part of the Tullock Member and in the Lance Formation in Wyoming (which are conspecific with ours from the Tullock) to Srivastava's genus Ghoshispora, and B.D. assigned similar specimens from the Campanian of Montana to Ghoshispora.…”

Mid-Cretaceous megaspore floras from Maryland, USA

“…However, no one has described similarly complete Albian and Cenomanian megaspore floras from the East Coast. Isolated megaspores from the Albian and Cenomanian have been identified based mainly on specimens appearing in palynological preparations from the East and Gulf coasts by Kimyai (1966), Paden Phillips and Felix (1971), Wolfe and Pakiser (1971), and Tschudy (1975); and from elsewhere in North America by Potter (1963), Ellis and Tschudy (1964), Hedlund (1966), Agasie (1969), Playford (1971), Bergad (1973), Romans (1975), Tschudy (1976), Wingate (1980), Zippi and Bajc (1990), Ravn (1995), Ravn and Witzke (1995), Scott and Stea (2002), and Hu et al (2008).…”

Reinterpretation ofPaleoazolla: a heterosporous water fern from the Late Cretaceous of Patagonia, Argentina

“…There are several genera of dispersed fossil megaspores, practically restricted to the Cretaceous, such as Ariadnaesporites Potonié emend. Tschudy (Baluyeva, 1964;Ellis and Tschudy, 1964;Tschudy, 1966;Hall, 1967Hall, , 1968Hall, , 1969aHall, , 1974Hall, , 1975Gunther and Hills, 1972;Bergad, 1973;Hills, 1974, 1976;Collinson, 1991Collinson, , 2001Batten et al, 1994Batten et al, , 1996Batten et al, , 1998Batten et al, , 2011aBatten et al, , b, 2016Rothwell and Stockey, 1994;Dettmann, 1995;Archangelsky et al, 1999;Nowak and Lupia, 2005;Kutluk et al, 2011;Lupia, 2011;Kutluk and Hills, 2015;Santamarina et al, 2018). Some of these with a worldwide distribution pattern, such as Ariadnaesporites, Arcellites, Balmeisporites and Ghoshispora, highlight the importance of the water ferns during the Cretaceous.…”