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  • Leveilleites hartnageli Foerste, 1923





    Kingdom: Plantae
    Phylum: Chlorophyta
    Class: Ulvophyceae
    Order: Dasycladales
    Family: Dasyporelleae
    Genus: Leveilleites
    Species: L. hartnageli
    Author Citation Foerste, 1923

    Geological Time Scale

    Eon: Phanerozoic
    Era: Paleozoic
    Period: Silurian
    Sub Period: None
    Epoch: Early
    International Age: Landovery, Aeronian


    Nurmekund Formation


    Acquired by: Purchase/Trade


    Otisaare Quarry
    Jögeva County


    Leveillites hartnageli or Leveilleites hartnageli, both names can be found in the literature (in the more recent literature Leveilleites is used).


    Tinn, O. et al. (2009): Thallophytic algal flora from a  new  Silurian  Lagersttte. Estonian Journal of Earth Sciences, 2009, 58, 1, 3842

    Viirika Mastik and Oive Tinn (2015): New dasycladalean algal species from the Kalana Lagerstätte (Silurian, Estonia) Journal of Paleontology 89(02):1-7.

    Viirika Mastik and Oive Tinn (2017): Leveilleites hartnageli Foerste 1923 (Rhodophyta?) from the Ordovician and Silurian of Laurentia and Baltica: redescription and designation of a neotype. Palaeoworld 26(4).

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    Beautiful specimen!


    One question, however:

    Isn't the "Raikküla" a Regional Stage instead of a Formation? See for example Tinn et al. (2009) and Tinn et al. (2015) for descriptions of the local geology of the Kalana quarry. The distinction is subtle, but still, it may be worth double checking this. A stage is a chronostratigraphic unit that can contain various lithostratigraphic units (formations, beds, markers, etc.), that were formed in different palaeo-environments, as long as these were being laid down at the same time. A single stage can thus contain very different rock types, which would therefore be considered as separate lithological units. (Similarly, it's also possible for a single lithostratigraphic unit to encompass multiple stages, if deposition occurred over a longer period of time.)

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    I don't know - the Geological Survey of Estonia lists Raikküla as a formation:

    http://geokogud.info/search.php?currentTable=sample&stratigraphy_1=1&stratigraphy=Raikküla Formation&stratigraphy_2=1


    Männik, Tinn et al. use both "Raikküla Regional Stage" and "Raikküla Formation":


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    Thanks for the interesting links. On the Geological survey of Estonia website: It is important to note that searching for "Raikküla Stage" yields 2774 records, whereas searching for "Raikküla Formation" yields only 31 records, which moreover are all associated with borehole data. Searching for the combination "Raikküla" (stratigraphy field) plus "Kalana" (locality field) yields 72 records, all of which only do mention the Stage.


    The Männik et al. (2015) paper you referenced provides a clear answer in its General geology background section: "Lateral facies changes in the Raikküla succession from shallow- to deeper-shelf carbonates have resulted in the erection of different lithostratigraphical units, the Raikküla, Nurmerkund and Saarde formations replacing each other from north to south." This means that the Raikküla Stage comprises three Formations, namely the 1) Raikküla Fm., 2) Nurmekund Fm., and 3) Saarde Fm.


    Männik et al. (2015) further write: "The Kalana quarry is located in central Estonia, in the northeastern part of the outcrop of the Nurmekund Formation (Fig. 1). In the quarry, the upper part of the Jõgeva Beds and the lower part of the Imavere Beds are exposed (Ainsaar et al. 2014)." It is clear from their Figures 1 and 2 that the quarry samples the Nurmekund Fm. Combining this info with Figure 2 of the Tinn et al. (2015) paper shows that the fossil algae come from the Jõgeva Beds.


    P.S. I recently obtained a number of specimens from this locality, hence my specific interest in their provenance.



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