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Incorrect furrows stone

UPDATE:
was now the picture of the stone snails from the Chiemgau impact from site and replaced by another. It appeared that at The new figure is a recording of the same hand piece at a very oblique illumination. Perhaps we should take this kind CIRT make a little game Dünnschlif. Fast
my attention a new furrows stone that present the people of CIRT on their website would have escaped. They claim for the first time a rock grooves to have found in Lake Chiemsee, is not a limestone, but a "silicate rock in the form of a sandstone. The same is found object is also described in a put-on scribd paper and can be visited here:

(the figure has since been removed)

The anonymous author says here now to see a typical regmaglypts sculpture. And actually follows the discovery of any of the previously submitted furrows stone sample. First, it would be really unusual grooves found on a siliceous sandstone, but these phenomena are actually limited to carbonates. Secondly, the expression of the sculpture is quite unusual. The imaged depressions and pits are not typical of furrows stones, they are actually too large and prominent circular. Our measurements (Huber & Goetz, 2010) at Chiemsee furrows stones showed a narrow width of about 3-10mm for the furrows. The pits on the newly submitted sandstone with 1-3 cm wide but always well. For clarification, I have the handle and the essential Structures attached here as a sketch.

striking the is often linear arrangement of the pits. Particularly striking here is a central wedge-shaped structure that tapers from the base to the tip of> 3 cm cm to \u0026lt;1. This structure consists of a series of overlapping holes, the cut lines are clearly visible. On closer examination, one can find also two well-identifiable, thin, bright lines (in the sketch in red). One of them accompanied the entire left side of this structure, another indicated at the top right corner and is marked on the lower right corner. Here you'll see a shard-like edge the slightly protruding from the matrix. A shell rest!

This also explains the central wedge-shaped structure. It is probably the impression of a larger, tower-shaped cochlea. The individual wells correspond to the imprints of distinct convex turns of the screw shell. Eligible for this come about representatives of the Turritelliden (Tower snails). Modern species of this family, such as Turritella terebra be up to 17 cm long. Fossil Turritelliden are from rocks of the nearby pre-Alpine Molasse known, so it's easy to imagine how the handle came into the Chiemsee.

The pits on the submitted hand piece are therefore neither as cyanobacterial phenomena noch als temperaturinduzierte Ablationserscheinungen oder Regmaglypten zu deuten. Vielmehr handelt es sich um verwitterte Überreste von Fossilabdrücken auf einer Sandsteinplatte.