Oklahoma

The Lower Cretaceous (Comanche) rocks of southeastern Oklahoma and southwestern Arkansas rest upon rocks of many different ages ranging from pre-Cambrian to Permian, but the floor they lie upon is a remarkably uniform plane with minor irregularities in spite of the folds and faults in the Paleozoic rocks. The floor represents a part of the Ouachita peneplain that was tilted slightly southward and submerged by the Cretaceous sea. A pronounced unconformity, though less striking than the one at the base of the Lower Cretaceous, separates the rocks of this series from the overlying Upper Cretaceous series. Its plane truncates all the several formations of the Lower Cretaceous, the youngest formations in Oklahoma, and the oldest in Arkansas. The Trinity formation, the basal unit of the Lower Cretaceous, contains beds in Arkansas that do not extend westward far into Oklahoma, owing to a westward overlap of the upper part of the Trinity over the lower part of the formation. The Trinity of Oklahoma is thus for the most part younger than the Trinity of Arkansas. Two contrasting relations thus exist in the Cretaceous of southeastern Oklahoma and southwestern Arkansas—(1) a westward overlap in the basal formation (Trinity) of the Lower Cretaceous and (2) an eastward overlap of the Upper Cretaceous across the truncated edges of the Lower Cretaceous. The westward overlap in Lower Cretaceous time was caused by a downwarping of the Texas-Oklahoma embayment that lies between the Llano and Ouachita uplifts. The eastward overlap in Upper Cretaceous time was evidently caused by a regional movement that formed the Mississippi embayment.

@article{miser1927lower,
    author = "Miser, Hugh D.",
    title = "Lower Cretaceous (Comanche) Rocks of Southeastern Oklahoma and Southwestern Arkansas",
    year = "1927",
    journal = "AAPG Bulletin",
    abstract = "The Lower Cretaceous (Comanche) rocks of southeastern Oklahoma and southwestern Arkansas rest upon rocks of many different ages ranging from pre-Cambrian to Permian, but the floor they lie upon is a remarkably uniform plane with minor irregularities in spite of the folds and faults in the Paleozoic rocks. The floor represents a part of the Ouachita peneplain that was tilted slightly southward and submerged by the Cretaceous sea. A pronounced unconformity, though less striking than the one at the base of the Lower Cretaceous, separates the rocks of this series from the overlying Upper Cretaceous series. Its plane truncates all the several formations of the Lower Cretaceous, the youngest formations in Oklahoma, and the oldest in Arkansas. The Trinity formation, the basal unit of the Lower Cretaceous, contains beds in Arkansas that do not extend westward far into Oklahoma, owing to a westward overlap of the upper part of the Trinity over the lower part of the formation. The Trinity of Oklahoma is thus for the most part younger than the Trinity of Arkansas. Two contrasting relations thus exist in the Cretaceous of southeastern Oklahoma and southwestern Arkansas—(1) a westward overlap in the basal formation (Trinity) of the Lower Cretaceous and (2) an eastward overlap of the Upper Cretaceous across the truncated edges of the Lower Cretaceous. The westward overlap in Lower Cretaceous time was caused by a downwarping of the Texas-Oklahoma embayment that lies between the Llano and Ouachita uplifts. The eastward overlap in Upper Cretaceous time was evidently caused by a regional movement that formed the Mississippi embayment.",
    url = "https://doi.org/10.1306/3d932789-16b1-11d7-8645000102c1865d",
    doi = "10.1306/3d932789-16b1-11d7-8645000102c1865d",
    number = "5",
    pages = "443-453",
    volume = "11"
}

@article{stovall1950acrocanthosaurus,
    author = "Stovall, J. Willis and Langston, Wann",
    title = "Acrocanthosaurus atokensis, a New Genus and Species of Lower Cretaceous Theropoda from Oklahoma",
    year = "1950",
    journal = "American Midland Naturalist",
    url = "https://doi.org/10.2307/2421859",
    doi = "10.2307/2421859",
    number = "3",
    pages = "696",
    volume = "43"
}

@misc{stovall1950acrocanthosaurus1,
    author = "Stovall, J. W. and Langston, W",
    title = "Acrocanthosaurus atokensis, a new genus and species of Lower Cretaceous Theropoda from Oklahoma",
    year = "1950",
    howpublished = "American Midland Naturalist, v. 43, p. 696-728",
    note = "talkorigins\_source = {true}; raw\_reference = {Stovall, J. W., and Langston, W., 1950, Acrocanthosaurus atokensis, a new genus and species of Lower Cretaceous Theropoda from Oklahoma: American Midland Naturalist, v. 43, p. 696-728.}"
}

@article{fennah1987a,
    author = "Fennah, R.G.",
    title = "A new genus and species of Cixiidae (Homoptera: Fulgoroidea) from Lower Cretaceous amber",
    year = "1987",
    journal = "Journal of Natural History",
    url = "https://doi.org/10.1080/00222938700770751",
    doi = "10.1080/00222938700770751",
    number = "5",
    pages = "1237-1240",
    volume = "21"
}

@article{weidich1995the,
    author = "Weidich, K. F.",
    title = "The genus Angulogavelinella Hofker, 1957, and its species (Foraminiferida, Rotaliina, Upper Cretaceous-lower Tertiary)",
    year = "1995",
    journal = "The Journal of Foraminiferal Research",
    url = "https://doi.org/10.2113/gsjfr.25.4.309",
    doi = "10.2113/gsjfr.25.4.309",
    number = "4",
    pages = "309-333",
    volume = "25"
}

@article{franzosa2005cranial,
    author = "Franzosa, Jonathan and Rowe, Timothy",
    title = "Cranial endocast of the Cretaceous theropod dinosaur Acrocanthosaurus atokensis",
    year = "2005",
    journal = "Journal of Vertebrate Paleontology",
    url = "https://doi.org/10.1671/0272-4634(2005)025[0859:ceotct]2.0.co;2",
    doi = "10.1671/0272-4634(2005)025[0859:ceotct]2.0.co;2",
    number = "4",
    pages = "859-864",
    volume = "25"
}

Sapeornithidae is a basal pygostylian family of Early Cretaceous primitive birds, in which only one genus and species, Sapeornis chaoyangensis, was reported before. This paper deals with a new genus and species of this family, Didactylornis jii gen. et sp. nov., which was unearthed from the Early Cretaceous Jiufotang Formation in western Liaoning. According to our phylogenetic analyses, both Didactylornis gen. nov. and Sapeornis form a sister group, which is basal to the clade formed by Confuciusornis and all the more derived birds, and more closely related to the short‐tailed pygostylian birds than to the long‐tailed avialian birds. The early history of pygostylian birds is poorly documented except for the studies of Confuciusornis and Sapeornis. The discovery of Didactylornis jii gen. et sp. nov. adds the new material for the study on the early evolution of birds.

@article{chongxi2008a,
    author = "Chongxi, YUAN",
    title = "A New Genus and Species of Sapeornithidae from Lower Cretaceous in Western Liaoning, China",
    year = "2008",
    journal = "Acta Geologica Sinica - English Edition",
    abstract = "Sapeornithidae is a basal pygostylian family of Early Cretaceous primitive birds, in which only one genus and species, Sapeornis chaoyangensis, was reported before. This paper deals with a new genus and species of this family, Didactylornis jii gen. et sp. nov., which was unearthed from the Early Cretaceous Jiufotang Formation in western Liaoning. According to our phylogenetic analyses, both Didactylornis gen. nov. and Sapeornis form a sister group, which is basal to the clade formed by Confuciusornis and all the more derived birds, and more closely related to the short‐tailed pygostylian birds than to the long‐tailed avialian birds. The early history of pygostylian birds is poorly documented except for the studies of Confuciusornis and Sapeornis. The discovery of Didactylornis jii gen. et sp. nov. adds the new material for the study on the early evolution of birds.",
    url = "https://doi.org/10.1111/j.1755-6724.2008.tb00323.x",
    doi = "10.1111/j.1755-6724.2008.tb00323.x",
    number = "1",
    pages = "48-55",
    volume = "82"
}

@article{kennedy2009species,
    author = "Kennedy, W. James and Reyment, Richard A. and MacLeod, Norman and Krieger, Jonathan",
    title = "Species discrimination in the Lower Cretaceous (Albian) ammonite genus Knemiceras von Buch, 1848",
    year = "2009",
    journal = "Palaeontographica Abteilung A",
    url = "https://doi.org/10.1127/pala/290/2009/1",
    doi = "10.1127/pala/290/2009/1",
    number = "1-3",
    pages = "1-63",
    volume = "290"
}

@article{demic2012paleobiology,
    author = "D'Emic, Michael D. and Melstrom, Keegan M. and Eddy, Drew R.",
    title = "Paleobiology and geographic range of the large-bodied Cretaceous theropod dinosaur Acrocanthosaurus atokensis",
    year = "2012",
    journal = "Palaeogeography, Palaeoclimatology, Palaeoecology",
    url = "https://doi.org/10.1016/j.palaeo.2012.03.003",
    doi = "10.1016/j.palaeo.2012.03.003",
    pages = "13-23",
    volume = "333-334"
}

Barremian-lower Aptian requieniid rudists from the Southern Carpathians and the Apuseni Mountains, in Romania, are represented by four new species of the genus Matheronia Munier-Chalmas: Matheronia dacica, Matheronia nerae, Matheronia carinata and Matheronia silvaeregis. In the study stratigraphic interval these species possess a potential biostratigraphic value. Their evolution trough time is essentially characterized by shell size increase. Matheronia looks restricted to the North Mediterranean Tethyan margin and the new Romanian species are interpreted as markers of the Carpatho-Cimmerian rudist province.

@article{masse2023new,
    author = "MASSE, JEAN-PIERRE and FENERCI-MASSE, MUKERREM and BUCUR, IOAN I.",
    title = "NEW SPECIES OF THE LOWER CRETACEOUS GENUS MATHERONIA MUNIER-CHALMAS (BIVALVE HIPPURITIDA) IN ROMANIA",
    year = "2023",
    journal = "Acta Palaeontologica Romaniae",
    abstract = "Barremian-lower Aptian requieniid rudists from the Southern Carpathians and the Apuseni Mountains, in Romania, are represented by four new species of the genus Matheronia Munier-Chalmas: Matheronia dacica, Matheronia nerae, Matheronia carinata and Matheronia silvaeregis. In the study stratigraphic interval these species possess a potential biostratigraphic value. Their evolution trough time is essentially characterized by shell size increase. Matheronia looks restricted to the North Mediterranean Tethyan margin and the new Romanian species are interpreted as markers of the Carpatho-Cimmerian rudist province.",
    url = "https://doi.org/10.35463/j.apr.2024.01.01",
    doi = "10.35463/j.apr.2024.01.01",
    number = "20 (1)",
    pages = "3-15"
}

@article{carrano2024first,
    author = "Carrano, Matthew T.",
    title = "First definitive record of Acrocanthosaurus (Theropoda: Carcharodontosauridae) in the Lower Cretaceous of eastern North America",
    year = "2024",
    journal = "Cretaceous Research",
    url = "https://doi.org/10.1016/j.cretres.2023.105814",
    doi = "10.1016/j.cretres.2023.105814",
    pages = "105814",
    volume = "157"
}