Thanngraben near Schwarzenbruck

Thanngraben
	Rocks in the Thanngraben
location	District of Nürnberger Land , Bavaria
Waters	Höhenbach
Mountains	Franconian Alb
Geographical location	49 ° 22 '5 " N , 11 ° 18' 16" E Coordinates: 49 ° 22 '5 " N , 11 ° 18' 16" E
Type	canyon
rock	Rhätsandstein , Burgsandstein
particularities	Protected landscape component

The Thanngraben is a Rhaetian sandstone gorge and begins west of Altenthann near Schwarzenbruck in the Middle Franconian district of Nürnberger Land . The small and narrow gorge ends after about three kilometers at the Fröschauer Weihern near Rummelsberg .

description

The small, formerly wild and romantic gorge begins near Altenthann . It is surrounded by heavily weathered sandstone rock formations. A brook that rises near the St. Veit Church in Althentann gave the gorge its name. In the further course there are numerous springs and after about a thousand meters the stream is called Höhenbach . It flows into the Schwarzach near Ochenbruck . At the upper end of the gorge, where coarse-grained and hard sandstones are underlain by softer ones, a small fish pond has been artificially created. To the north of the pond there is a memorial stone that commemorates the building of the main collector Altenthann. The wastewater from Altenthann is piped through the Thanngraben and fed to the treatment plant in Schwarzenbruck. In 2013, a wide, gravel forest road was built through part of the gorge and thus impaired the picturesque appearance.

In the upper part of the gorge, rock cellars were created, but they are in danger of collapsing.

geology

Over the millennia, the brook has dug its way into the layers of the Rhät- Lias sandstone and the Upper Feuerletten, producing natural rock outcrops. About 200 million years ago, in the transition period between the Triassic (Upper Keuper, Rhaet) and the Jura (Lias), there was a shallow inland sea in Central Franconia in the northwest and the mainland in the southeast. Fine-grained and sandy sediments were deposited in this sea , which later solidified into clay and sandstone. Since it is not possible to clearly distinguish which of the rocks are to be assigned to the Rhaetian and which to the Lias, these are called the Rhaet-Lias transition layers. The brown-gray Rhätsandstein can be found on the upper slopes and the upper reaches of the Thanngraben.

and display information about the image

180 degree panoramic view, Thanngraben near Altenthann

tourism

The Thanngraben is a near-tourist destination and is accessible all year round. The marked hiking trail Fränkischer Jakobsweg leads through the gorge. A few kilometers to the west is the Schwarzachklamm .