Stratigraphic ranges of selected spores and pollen from the Fredericksburg group (Albian) of the southern United States

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Abstract
The Fredericksburg Group of the southern United States consists of the Walnut Formation, the Goodland Formation, and the Kiamichi Formation in ascending stratigraphic order. The Walnut Formation and most of the Goodland Formation are of middle Albian Age and the Kiamichi Formation is late Albian in age. The middle/upper Albian boundary falls within the Goodland Formation on the basis of ammonite zones, and at the base of the Kiamichi Formation according to foraminiferal evidence. The spore‐pollen assemblages indicate late middle Albian to early late Albian Age for the Fredericksburg Group. The total stratigraphic ranges of eighty‐four spore‐pollen species included in the fifty genera recognized in the Fredericksburg Group assemblages were determined by considering their previously recorded occurrences. Twenty‐two species of eighteen genera are indigenous to the Fredericksburg Group. Eleven Jurassic species occur throughout the Cretaceous, whereas fourteen such species became extinct in the Middle Cretaceous. Eleven species first appear in the Lower Cretaceous and either persist throughout the Cretaceous or extend into the Tertiary. Five species are restricted to strata of Aptian‐Albian Age and five to the strata of Albian‐Cenomanian Age. Asteropollis asteroides, Cicatricosi‐sporites spiralis, Crybelosporites pannuceus, Gemmatricolpites gemmatus, Impardecispora texensis, Phimopollenites augathel‐laensis, P. pannosus, Rousea georgensis, Striatopollis paraneus, Tappanispora loeblichii, T. reticulata, Tricolpites sagax are characteristic species in strata of Albian‐Cenomanian Age and have an inter‐regional correlation potential.

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