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Re: Solnhofen quarrying pattern

In article <20050913.145748.-993603.0.bigelowp@juno.com>, Phil Bigelow 
> I have seen photos of the Solnhofen quarry that show a rather large
> operation.
       I went on holiday to Bavaria for the 1999 eclipse (something 
vaguely appropriate about watching the "return of the light" from the 
heart of darkness at Dachau KZ. "Arbeit mach frei", awa bile yer heid, 
as they say in Torry.) and of course visiting Solenhofen was a 
necessary part of the agenda.
       There are a considerable number of mines in use and abandoned 
around Solenhofen, mostly dug in from the edges of the dissected 
plateau around 100m above the river where Solenhofen itself is. 
Evidently, from the shape of the quarries and the lay of the beds 
within them, they're targeting particular beds, mostly 10~20m below the 
surface. That gives the characteristic "strip mined" appearance of the 
active quarries. The restoration of the abandoned mines is pretty good 
though - nice woodland walking. Not really designed for getting around 
on foot though, but it would be nice country on a pedal bike.
       The local maps mark a number of areas as being for 
"hobbysteinbrukken", hobby stone breaking or fossil collecting, with 
the clear implication that it's not permitted in other areas. A lot of 
the abandoned quarries are unsecured with appreciable sub-vertical 
exposures and the obvious risks of rockfall from above and 
trip/slip/fall hazards underfoot on the spoil, so I can see why the 
landowners want at least a modesty board of discouraging tourists from 
getting injured. Good boots and a good semi-hard hat should be quite 
sufficient if there's a modicum of common sense inside the skull.
       (Seeing the pics in the PDF that Jerry Harris refers to, that's 
at Langenaltheim, which is WSW of Solenhofen, SW of Pappenheim, about 8 
km away from each up on the plateau. There are several unsecured, 
abandoned quarries nearer the drop into the valley.)
> How much deeper does the micritic lagoonal facies go in this area?
       The entire series is on the order of 50m thick around Solenhofen 
itself ; I think it's a little thicker to the East at Eichstaat. It's 
thinner to the SW around the Nordlingen meteorite crater, and also 
dirtier so unsuitable for lithography. you really would need a car to 
get around the sites at Nordlingen, whereas the train runs through the 
Eichstaat/ Solenhoen/ Pappenheim valley which makes Shank's pony quite 
enjoyable for a holiday.
 Aidan Karley,
 Aberdeen, Scotland,
 Location: 57°10' N,  02°09'  W (sub-tropical Aberdeen), 0.021233
 Written at Wed, 14 Sep 2005 08:38 +0100

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