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  • Oktavites (Monograptus) spiralis

    Images:

    TqB

    By TqB

    Taxonomy

    Graptolite

    Kingdom: Animalia
    Phylum: Pterobranchia
    Class: Graptolithina
    Order: Graptoloidea
    Family: Monograptidae
    Genus: Oktavites
    Species: Oktavites spiralis
    Author Citation (Geinitz, 1842)

    Geological Time Scale

    Eon: Phanerozoic
    Era: Paleozoic
    Period: Silurian
    Sub Period: None
    Epoch: Early
    International Age: Llandovery/ Telychian

    Stratigraphy

    Lower Graptolitic Shales (informal)

    Biostratigraphy

    O. spiralis Zone

    Provenance

    Date Collected: 10/01/2015
    Acquired by: Purchase/Trade

    Dimensions

    Diameter: 35 mm

    Location

    Zdanow section, Bardzkie Mountains.
    Ząbkowice Śląskie County
    Lower Silesia Province
    Poland

    Comments

    One of a number of spiral monograptids from this period and a zone species, these have all been referred to Monograptus at various times as well as separate genera based on rhabdosome form which may not be of significant importance.

    It is bisected by an unidentified straight Monograptus.

     

     

    Reference for ID (as Monograptus spiralis): Elles & Wood 1901-1918, Monograph on British Graptolites, Pal. Soc. Monograph 33.

    (Plate XLVIII, fig. 7).

     

    Now generally referred to Oktavites Levina, 1928, e.g. in J. A. Zalasiewicz, L. Taylor et al 2009, Graptolites in British Stratigraphy, Geol Mag. 146, pp. 785-850.

    And here: http://fossiilid.info/9458

    Go to fossils Graptolites

    User Feedback


    Tidgy's Dad

    That's smashing, got a few graptolites myself, but nothing as impressive as that! 

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    Mediospirifer

    Mediospirifer

    Posted

    Very impressive! I didn't know graptolites could spiral.

     

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    TqB
    12 hours ago, Tidgy's Dad said:

    That's smashing, got a few graptolites myself, but nothing as impressive as that! 

     

    3 hours ago, Mediospirifer said:

    Very impressive! I didn't know graptolites could spiral.

     

     

    Thanks - I don't buy many but this jumped out... :)

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