samedi 2 novembre 2013

Mixed or Unspecified (according to Wikipedia, List of Fossil Sites)

Mesozoic to Cenozoic

North America
Tepetate FormationMexicoCretaceous – Middle Eocene

More precisely Maastrichtian - Danian

North America
Rancho Nuevo FormationMexico
South America
Jaguel FormationArgentina
Yacoraite FormationArgentina
López de Bertodano Formation
Seymour Island
Vega Island

Paleozoic to Mesozoic

Karoo Supergroup
Golden Gate Highlands
Southern AfricaPermian – Lower Jurassic

Precambrian – Paleozoic

Georgina BasinAustralia: Northern Territory, QueenslandNeoproterozoic – late Paleozoic


North America
Hilda archaeological siteCanada: Alberta

Correction: the Hilda site is not unspecified, but "late" Cretaceous.

24 commentaires:


    "The deposits of this formation mainly date from the Maastrichtian of the Upper Cretaceous, but the Cretaceous–Paleogene boundary (K–T boundary) runs right through this formation near its top, and the uppermost parts are consequently from the Danian (Lower Paleocene). "


    We describe a fossils assemblage of brackish water identified on sedimentary sequences of the Yacoraite Formation (Maastrichtian – Danian), in the localities of Maimará and Jueya, Jujuy - Northwest Argentine. The dominant lithology of the study levels are characterized by a calcareous sandstones succession, with ripplestratified structure, upward-fining. Fine to very fine sandstone lenses occur in this fossiliferous interval. The sandstones are interpreted as storm washover deposits. In these sequences we have found numerous disarticulated remains of fishes (Pycnodontiforms and Siluriforms), fragments of tetrapods? (Tetrapoda), a tooth of crocodile (Crocodylidae), mollusks badly preserved (Gastropods and Bivalves) of problematic taxonomy, estromatolites (LLHC, LLHS and dome type). Also was identified a set of fossil traces integrated by traces of birds (Avipedidae) and Skolitos ichnofacies , besides a Domichnia trace on an estromatolitic rock, caused by a perforant bivalve, also preserved. Our study of the fossils assemblage, traces, sediments, and sedimentary structures indicates a brackish mixed environment, of low depth and high energy, probably estuarine.

    OK ....


    ... Due to the early Maastrichtian global sea-level high, marine waters ingressed from the northwest into this underfilled basin. Subsidence decreased during the Late Maastrichtian and was low during the Danian. It increased again in the latest Danian, for which a slight transgression is recorded, and peaked in the early Selandian. ...

    Sounds like a case for Tas ... but not a case for two diverse faunas one on top of other.

  4. What about Tepetate Formation Mexico?

    no access

    Carrie E. Schweitzer, Gerardo González-Barba, Rodney M. Feldmann, and David A. Waugh

    aResearch Associate, Section of Invertebrate Paleontology; Department of Geology, Kent State University Stark Campus, 6000 Frank Avenue NW, Canton, Ohio 44720 (

    bDepartamento de Geología, UABCS, A.P. #19B, C.P.23080, La Paz, Baja California Sur, México (

    cResearch Associate, Section of Invertebrate Paleontology; Department of Geology, Kent State University, Kent, Ohio, 44242 (

    dDepartment of Geology, Kent State University, Kent, Ohio 44242 (

    Seven species of shrimps referable to the Thalassinoidea and four species referable to the Paguroidea have been recovered from the Eocene Bateque and Tepetate formations of Baja California Sur, México. The large number of callianassid and paguroid taxa found in these essentially equivalent, very similar formations, is unusual in the decapod fossil record. Only a few other occurrences of such large numbers of fossil paguroid and thalassinoid taxa within a single unit are known; these occurrences range in age from Eocene to Miocene. Cuticular studies indicate that callianassid chelae were bioeroded, possibly by algae. An unusual occurrence of a hash of callianassid chelae may have sequence-stratigraphic value.



    Carrie E. Schweitzer, Rodney M. Feldmann, Gerardo González-Barba, Vlasta Ćosović
    [ "Research Associate, Section of Invertebrate Paleontology Department of Geology, Kent State University Stark Campus, 6000 Frank Ave. NW, North Canton, OH 44720 ( )"]; [ "Research Associate, Section of Invertebrate Paleontology Department of Geology, Kent State University, Kent OH 44242 ( )"]; [ "Departamento de Biología Marina and Museo de Historia Natural-UABCS, A.P.#19B, C.P.23080, La Paz, Baja California Sur, México ( )"]; [ "Department of Geology and Paleontology, Faculty of Science, University of Zagreb, Horvatovac, 102A, 10000 Zagreb, Croatia ( )"]
    Annals of Carnegie Museum (Impact Factor: 0.65). 01/2009; DOI:10.2992/0097-4463(2007)76[1:DCBFTE]2.0.CO;2

    ABSTRACT A large collection of brachyuran specimens from the middle Eocene Tepetate Formation, Baja California Sur, Mexico, has yielded sufficiently well-preserved specimens to provide revised descriptions and diagnoses for genera and species previously known from the area. Revised, more complete descriptions are given for Eriosachila bajaensis Schweitzer et al., 2002, and Lobonotus mexicanus Rathbun, 1930. A gone-placid specimen is questionably referred to Carcinoplax, which has a well-established Pacific record during the Miocene. All of the specimens of Amydrocarcinus dantei Schweitzer et al., 2002, thus far collected for which gender can be determined are males, suggesting that there may have been environmental or behavioral segregation of males and females of this species. Analysis of benthic and planktonic foraminiferans suggests that the Tepetate Formation was deposited in subtropical conditions, probably within the photic zone but below the seasonal thermocline, perhaps below 100–120 m. The age of the Tepetate Formation, according to larger foraminiferans, is middle Eocene, and according to planktonic foraminiferans is further constrained as upper middle Eocene (Bartonian). This age corresponds to the P14 foraminiferal zone based upon the Berggren et al. (1995) scheme and the E13 zone based upon the work of Berggren and Pearson (2005).


    Sixty species of calcareous nannoplankton from the Tepetate formation were recovered from a drill
    hole near Las Pocitas, Baja California Sur. In spite of its low abundance and erratic distribution throughout
    the sedimentary column, the great amount of reworked species, as well as the absence of traditional index
    fossils representing the standard tropical biozonation, the co-occurrence of Reticulofenestra dyctioda,
    Rhabdosphaera crebra, R. pinguis, Micrantholithus fl os, Pontosphaera pectinata and Lanternithus minutus
    situates the studied stratigraphic column at the Discoasteroides kuepperi CP12a Subzone of Okada and
    Bukry, dated between 49.5 and 49 Ma at the top of the upper lower Eocene. The population structure as well as the lithological features of the sedimentary package, suggest
    a temperate open-sea deposit, which confi rms interpretations based on other marine fossils at arroyo
    Datilar, El Conejo, Salada, Colorado y Las Pocitas, where rocks of the lower middle Eocene Tepetate
    formation crop out.

    Key words: biostratigraphy, calcareous nannofossils, Tepetate formation, Eocene, Baja California Sur,



    An integrated study of Foraminifera, Ostracoda and lithostratigraphy was conducted on samples of the Tepetate Formation from the Arroyo Colorado locality, Baja California Sur (Mexico). Based on the planktonic Foraminifera, Acarinina pentacamerata (latest lower Eocene) and Hantkenina nuttalli (earliest middle Eocene) zones were recognized that indicate an age range from 51.2 to 48.4 Ma. Benthic Foraminifera suggest correlation with the Penutian to Narizian California stages, which agrees with the planktonic foraminiferal biozones. The sedimentary structures and microfossils throughout the sequence indicate deposition within a transgressive-regressive-transgressive cycle, including environments from the inner to outer marine shelf in depths shallower than 150 m. Gravity flows dominate the sequence, and storm-deposited beds are present in the middle of the section. Considering the nature of this formational unit, we recommend the designation of a composite stratotype, according to the North American

    Stratigraphic Code.

    Key words: Eocene, Baja California Sur, Mexico, Tepetate Formation, biostratigraphy.


     Unusually preserved decapod specimens from the Eocene Bateque Formation of Baja California Sur, México,
    have heretofore been undescribed. This robust fauna has yielded thirteen taxa with seven new species, including
    Homola bajaensis, Raninoides acanthocolus, R. proracanthus, Prehepatus mexicanus, Daldorfia salina, Anatolikos undecimspinosus, and Paracorallicarcinus tricarinatus. In addition, several taxa are identifiable to the family level. Laeviranina is synonymized with Raninoides, resulting in numerous new combinations. The Bateque Formation fauna has yielded the oldest known occurrence of Anatolikos, Homola, Daldorfia, and the Daldorfiidae as well as the first
    notice of Prehepatus in the Eocene and the first articles of the cheliped of Prehepatus other than those of the chelae. Micropaleontological interpretation of the sediments collected at Pelican Island suggests that the Bateque Formation at that location was deposited in an oligotrophic, outer shelf or platformal setting, in water of at least 30 m depth. The decapods of the Bateque Formation exhibit Tethyan and North Pacific distributional patterns and are a mixture of warm and cool, shallow, epicontinental, and deep water taxa. These patterns are interpreted to be a result of Baja California's Eocene position in the crossroads of the North Pacific and Tethyan distributional pathways.

     Key words: Decapoda, Brachyura, Anomura, Eocene, Bateque Formation, Baja California, Mexico


    The tepetate formations of the Xalapa area are built on an old Pleistocene meseta of andesitic lavaflows.
    Their expansion along the meseta surface is progressive and each stage corresponds to a typical landscape:
    convex hills with incipient tepetate (plinthic or initial stage) that change gradually to straightflat-convex hills
    with laminar indurated layers (advanced stage). The ferralitic weathering of the andesite basement, previous
    to tepetate formation, occurred during a long period of volcanic and climatic stability, placed in middle
    Pleistocene. The indurations we observe nowadays started during the Young Pleistocene.

    KEY WORDS : Landscape - Volcanism - Geochronology - Mexico - Geomorphology - Silicification.

  10. It is the one place in Latin America where I have been, an outing in a car, starting and returning San Diego CA.

    The google gave nothing about Cretaceous and it gave nothing about a Cretaceous land fauna lying under an Eocene land fauna.

    Before the flood it was a gret place for shrimps and calamari, but hardly a great place to distinguish between Cretaceous and Eocene land faunas.

  11. When I look for Rancho Nuevo I get an interesting result:

    This book is about:

    Mollusca of the Tertiary Formations of Northeastern Mexico

    Par Geological Society of America,Julia Gardner

    And this is about Cretaceous - yes, with dinosaurs:

    The Late Cretaceous Difunta Group of the Parras Basin, Coahuila, Mexico and its vertebrate faunamore
    by James Kirkland

    So we have a cretaceous land fauna with dinos - and a tertiary marine fauna with ... can you take more shellfish and polpa?

  12. May I hint at the fact that Jaguel Formation, Argentina is pretty marine stuff as well?

    It is Jagüel, btw.

  13. Lopez de Bertodano Formation
    From Wikipedia, the free encyclopedia

    Jump to: navigation, search
    Lopez de Bertodano Formation
    Stratigraphic range: Maastrichtian
    70 to 66 Ma
    Type Geological formation
    Unit of Marambio Group
    Overlies Snow Hill Island Formation
    Primary siltstone, mudstone
    Other concretion, sandstone
    Region James Ross Island group, Antarctica

    The Lopez de Bertodano Formation is a geological formation in the James Ross archipelago of the Antarctic Peninsula. The strata date to the end of the Late Cretaceous (upper-lower Maastrichtian stage[1]), about 70-66 million years ago. Dinosaur remains are among the fossils that have been recovered from the formation[2] and include at least two and probably as much as six lineages of undisputably modern birds: one related to waterfowl, a primitive shorebird or related form, 1-2 species of possible loons, a large and possibly flightless bird belonging to a lineage extinct today as well as a partial skull that might belong to either of the smaller species or represent yet another one.

    Oh, it was only Maastrichtian, not Danian, then?

    AND there are modern birds along the dinosaurs.

  14. The rocks making up Seymour Island date mainly from the Late Cretaceous to the Eocene. Successively younger rock formations found on the island are the López de Bertodano Formation (Cretaceous to early Paleocene) Sobral Formation and Cross Valley Formation (Paleocene) and La Meseta Formation (Eocene).

    In November 1882, when Norwegian Captain, Carl Anton Larsen landed his ship, the Jason, on Seymour Island, he returned with more than maps of the territory, he found fossils of long-extinct species. Interestingly, Larsen's trip aboard the Jason was significantly more successful than his Swedish Antarctic Expedition journey between 1901 and 1904. During that trip, his ship, the Antarctic, was crushed and sunk by icebergs, and he and his crew were forced to weather fourteen months on the neighboring Snow Hill Island, surviving on penguins and seals. Ever since his voyage on the Jason, the island has been the subject of paleontological study.

    Seymour Island has been the site of much study of the Eocene period of climatic cooling, a process that culminated in the initiation of Antarctic glaciation. Studies of the fine fraction carbonate from sites in the Southern Ocean suggest that, rather than a monotonic decrease in temperature over the Eocene period, the middle of the epoch was punctuated by a brief duration of warming (Bohaty and Zachos, 2003).[4]

    Seymour Island has been a site of study of many fossils from this particular part of the Eocene period, during which there was a more flourishing ecosystem with diverse biota as a result of the warmer climate. A diverse array of fossilized species have been studied on the Island, including extinct penguin species (such as Palaeeudyptes klekowskii and Archaeospheniscus wimani), various species in the bivalvia class and various types of flora and fauna.[4]

    A fossil marsupial of the extinct family Polydolopidae was found on Seymour Island in 1982.[5] This was the first evidence of land mammals having lived in Antarctica. Further fossils have subsequently been found, including members of the marsupial orders Didelphimorphia (opossum) and Microbiotheria,[6] as well as ungulates and a member of the enigmatic extinct order Gondwanatheria, possibly Sudamerica ameghinoi.[7][8][9]

  15. Did I miss something or was there no rock on Seymour Island where Dinos where under and Marsupials above them?

  16. Vega Island now:

    Clarke, J.A.; Tambussi, C.P.; Noriega, J.I.; Erickson, G.M. & Ketcham, R.A. (2005): Definitive fossil evidence for the extant avian radiation in the Cretaceous. Nature 433: 305-308. doi:10.1038/nature03150 PDF fulltext Supporting information

    External links

    New dinosaur finds in Antarctica paint fuller picture of past ecosystem, from the National Science Foundation, February 6, 1998.

    Antarctic Researchers to Discuss Difficult Recovery of Unique Juvenile Plesiosaur Fossil, from the National Science Foundation, December 6, 2006.

  17. Georgina Basin has a page which seems less than explicit as to fossils.

    It is from the Australian Govtm!

    "Epoch Min: Devonian.
    Epoch Max: Cryogenian (Neoproterozoic).
    Age Min: 355 Ma.
    Age Max: 850 Ma."

    Wait, it is not a question of definite fossils from Cryogenian lying under definite fossils from Devonian?

    It is a guess "Cryogenian at the oldest, Devonian at the youngest".

  18. I asked about shellfish and polpa, I meant shellfish and polpo of course ....

    1. Besides, I was wrong on polpo, decapods are not squids, but prawns and shrimp and such, it is cephalopods that are squid.