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  • Archaeocyathid


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    Tidgy's Dad
    • About 515 million years old, this archaeocyathid shows excellent specimens with both lateral and vertical sections.

      The internal septa separating the internal wall from the external wall can clearly be seen and the central cavity. 

       

      Archaeocyatha

       

    Taxonomy

    Archaeocyathid

    Kingdom: Animalia
    Phylum: Archaeocyathida
    Class: Regulares
    Order: Ajacicyathida
    Family: Ethmocyathidae
    Genus: Ethmocyathus
    Species: E. lineatus
    Author Citation R. Bedford & W.R.Bedford, 1934

    Geological Time Scale

    Eon: Phanerozoic
    Era: Paleozoic
    Period: Cambrian
    Epoch: Early

    Stratigraphy

    Hawker Group
    Ajax Limestone Formation

    Provenance

    Acquired by: Purchase/Trade

    Dimensions

    Diameter: 1.0cm

    Location

    Ajax Mine
    Beltane
    South Australia
    Australia

    Comments

    About 515 million years old, this archaeocyathid shows excellent specimens with both lateral and vertical sections.

    The internal septa separating the internal wall from the external wall can clearly be seen and the central cavity. 

     

    Archaeocyatha

     



    User Feedback


    Lovely specimen, I keep nearly buying one or two of these and will succumb eventually... :) What's the size?

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    Tidgy's Dad

    Posted · Report

    Thank you. I loved your graptolites, too.

    The widest point of the block is about 5 cm the one specimen where you can clearly see the internal structure as if from above is 1 cm at its widest point.the ones 'lying down' up to 13mm. 

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    piranha

    Posted · Report

    Here are excellent papers with archaeocyathids from the Ajax Mine.

    If you're interested, I have pdfs of Debrenne1974 and Kruse 1982.

    Send a PM with your email address and I'll be happy to send them.

     

    Taylor, T.G. (1910)

    The Archaeocyathinae from the Cambrian of South Australia, with an account of the morphology and affinities of the whole class.

    Memoirs of the Royal Society of South Australia, 2:55-188   LINK

     

    Debrenne, F. (1969) 

    Lower Cambrian Archaeocyatha from the Ajax Mine, Beltana, South Australia.

    British Museum of Natural History Bulletin, Geology,17:295-376   LINK

     

    Debrenne, F. (1974)

    Anatomie et systématique des Archéocyathes réguliers sans plancher d'Ajax Mine: Cambrien inférieur, Australie du Sud.

    Geobios, 7(2):91-138

     

    Kruse, P.D. (1982)

    Archaeocyathan Biostratigraphy of the Gnalta Group at Mt. Wright, New South Wales.

    Palaeontographica Abteilung A, 177:129-212

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    14 hours ago, Tidgy's Dad said:

    Thank you. I loved your graptolites, too.

    The widest point of the block is about 5 cm the one specimen where you can clearly see the internal structure as if from above is 1 cm at its widest point.the ones 'lying down' up to 13mm. 

     

    Thanks! 

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