Paleoenvironments

@article{russell1973the5,
    author = "Russell, D. A",
    title = "The environments of Canadian dinosaurs",
    year = "1973",
    journal = "Canadian Geographic Journal, v. 87, p. 4-11",
    note = "talkorigins\_source = {true}; raw\_reference = {Russell, D. A., 1973, The environments of Canadian dinosaurs: Canadian Geographic Journal, v. 87, p. 4-11.}"
}

@misc{fedonkin1981the1,
    author = "Fedonkin, M. A",
    title = "The Byelmorian Vendian Biota (Precambrian Soft-Bodied Fauna of the Northern Russian Platform) [in Russian]",
    year = "1981",
    howpublished = "Vyp, Akad. Nauk SSSR, Geol. Inst., Trudy, 100 p",
    note = "talkorigins\_source = {true}; raw\_reference = {Fedonkin, M. A., 1981, The Byelmorian Vendian Biota (Precambrian Soft-Bodied Fauna of the Northern Russian Platform) [in Russian]: Vyp, Akad. Nauk SSSR, Geol. Inst., Trudy, 100 p.}"
}

@misc{viohl1984geology6,
    author = "Viohl, G",
    title = "Geology of the Solnhofen Lithographic Limestones and the Habitat of Archeopteryx, in Hecht, M. K., Ostrom, J. H., Viohl, G., and Wellnhofer, P., eds., The Beginnings of Birds",
    year = "1984",
    howpublished = "Eichstatt, Fruende des Jura-Museums, p. 31-44",
    note = "talkorigins\_source = {true}; raw\_reference = {Viohl, G., 1984, Geology of the Solnhofen Lithographic Limestones and the Habitat of Archeopteryx, in Hecht, M. K., Ostrom, J. H., Viohl, G., and Wellnhofer, P., eds., The Beginnings of Birds: Eichstatt, Fruende des Jura-Museums, p. 31-44.}"
}

@misc{ludvigsen1986trilobite4,
    author = "Ludvigsen, R",
    title = "Trilobite biostratigraphic models and the paleoenvironment of the Burgess Shale (Middle Cambrian), Yoho National Park, British Columbia",
    year = "1986",
    howpublished = "Canadian Paleontology and Biostratigraphy Seminars",
    note = "talkorigins\_source = {true}; raw\_reference = {Ludvigsen, R., 1986, Trilobite biostratigraphic models and the paleoenvironment of the Burgess Shale (Middle Cambrian), Yoho National Park, British Columbia: Canadian Paleontology and Biostratigraphy Seminars.}"
}

@incollection{jerzykiewicz1987semiarid2,
    author = "Jerzykiewicz, T. and Sweet, A. R",
    editor = "Currie, P. J. and Koster, E.",
    title = "Semiarid Floodplain as a Paleoenvironmental Setting of the Upper Cretaceous Dinosaurs: Sedimentological Evidence from Mongolia and Alberta",
    year = "1987",
    booktitle = "Fourth Symposium on Mesozoic Terrestrial Ecosystems",
    publisher = "Drumheller, Canada, Tyrrell Museum, p. 120-124",
    note = "talkorigins\_source = {true}; raw\_reference = {Jerzykiewicz, T., and Sweet, A. R., 1987, Semiarid Floodplain as a Paleoenvironmental Setting of the Upper Cretaceous Dinosaurs: Sedimentological Evidence from Mongolia and Alberta, in Currie, P. J., and Koster, E., eds., Fourth Symposium on Mesozoic Terrestrial Ecosystems: Drumheller, Canada, Tyrrell Museum, p. 120-124.}"
}

@misc{lehman1987late3,
    author = "Lehman, T. M",
    title = "Late Maastrichtian paleoenvironments and dinosaur biogeography in the western interior of North America",
    year = "1987",
    howpublished = "Palaeogeography, Palaeoclimatology, Palaeoecology, v. 60, p. 189-217",
    note = "talkorigins\_source = {true}; raw\_reference = {Lehman, T. M., 1987, Late Maastrichtian paleoenvironments and dinosaur biogeography in the western interior of North America: Palaeogeography, Palaeoclimatology, Palaeoecology, v. 60, p. 189-217.}"
}

The Early Jurassic ornithischian dinosaurs in Laurasia are dominated by armored dinosaurs, with other early ornithischian groups being rare. Here, a new taxon, Archaeocursor asiaticus gen. et sp. nov., is reported from the Lower Jurassic of southwestern China. Phylogenetic analysis places Archaeocursor asiaticus as the earliest-diverging ornithischian dinosaur yet discovered in Asia, albeit with weak support. Osteohistological analysis of the femoral cross-section suggests that Archaeocursor asiaticus was a young adult at the time of death, indicating a small body size of approximately 1 m in body length. This discovery extends the known presence of ornithischian dinosaurs in East Asia to the Pliensbachian or even late Sinemurian stages. Additionally, it points to an earlier dispersal event of Early Jurassic ornithischian dinosaurs from Gondwana to Laurasia, including East Asia, which appears to be independent of, and possibly earlier than, the dispersal of armored dinosaurs.

@article{doi101016jisci2024111641,
    author = "Yao, Xi and Zhao, Qi and Ren, Tingcong and Wei, Guangbiao and Xu, Xing",
    title = "New evidence for the earliest ornithischian dinosaurs from Asia.",
    year = "2025",
    journal = "iScience",
    abstract = "The Early Jurassic ornithischian dinosaurs in Laurasia are dominated by armored dinosaurs, with other early ornithischian groups being rare. Here, a new taxon, Archaeocursor asiaticus gen. et sp. nov., is reported from the Lower Jurassic of southwestern China. Phylogenetic analysis places Archaeocursor asiaticus as the earliest-diverging ornithischian dinosaur yet discovered in Asia, albeit with weak support. Osteohistological analysis of the femoral cross-section suggests that Archaeocursor asiaticus was a young adult at the time of death, indicating a small body size of approximately 1 m in body length. This discovery extends the known presence of ornithischian dinosaurs in East Asia to the Pliensbachian or even late Sinemurian stages. Additionally, it points to an earlier dispersal event of Early Jurassic ornithischian dinosaurs from Gondwana to Laurasia, including East Asia, which appears to be independent of, and possibly earlier than, the dispersal of armored dinosaurs.",
    url = "https://pmc.ncbi.nlm.nih.gov/articles/PMC11761276/",
    doi = "10.1016/j.isci.2024.111641",
    pmcid = "PMC11761276",
    pmid = "39868031"
}

Secondary eggshell units, though rarely observed in modern avian eggshells, are marked structures in non-avian dinosaur eggshells that offer valuable paleobiological insights. Despite their significance, the origins of secondary eggshell units remain understudied, leading to debates in paleontology, including the hypothesis of an abiogenic origin for these structures. Here, we demonstrate that secondary eggshell units in non-avian dinosaur eggshells are biogenic in nature, based on analyses using advanced microscopic techniques. The structural characteristics of these units suggest a formation mechanism similar to that of turtle and crocodile eggshells, with matrix fibers likely initiating their development. Furthermore, a diminishing presence of secondary eggshell units in non-avian maniraptoran dinosaurs points to the evolution of a more refined physiological process for eggshell formation in this lineage. These findings shed light on the evolutionary trajectory of eggshell biomineralization in dinosaurs and their close relatives.

@article{doi101126sciadvadt1879,
    author = "Zhang, Shukang and Choi, Seung and Kim, Noe-Heon and Xie, Junfang and Park, Yong and Plümper, Oliver and Sellés, Albert G",
    title = "Biogenic origin of secondary eggshell units in dinosaur eggshells elucidates lost biomineralization process in maniraptoran dinosaurs.",
    year = "2025",
    journal = "Science advances",
    abstract = "Secondary eggshell units, though rarely observed in modern avian eggshells, are marked structures in non-avian dinosaur eggshells that offer valuable paleobiological insights. Despite their significance, the origins of secondary eggshell units remain understudied, leading to debates in paleontology, including the hypothesis of an abiogenic origin for these structures. Here, we demonstrate that secondary eggshell units in non-avian dinosaur eggshells are biogenic in nature, based on analyses using advanced microscopic techniques. The structural characteristics of these units suggest a formation mechanism similar to that of turtle and crocodile eggshells, with matrix fibers likely initiating their development. Furthermore, a diminishing presence of secondary eggshell units in non-avian maniraptoran dinosaurs points to the evolution of a more refined physiological process for eggshell formation in this lineage. These findings shed light on the evolutionary trajectory of eggshell biomineralization in dinosaurs and their close relatives.",
    url = "https://pmc.ncbi.nlm.nih.gov/articles/PMC12124393/",
    doi = "10.1126/sciadv.adt1879",
    pmcid = "PMC12124393",
    pmid = "40446053"
}

@misc{crossrefNonepaleoenvironments,
    title = "Paleoenvironments",
    year = "None",
    booktitle = "SpringerReference",
    url = "https://doi.org/10.1007/springerreference\_30148",
    doi = "10.1007/springerreference\_30148"
}