It seems to be formed in the Muschelkalk of the Trias formation, and so far no limestone stalactites have been discovered.
"Ice-Caves of France and Switzerland" by George Forrest Browne
A flying reptile: species of this genus have been found in the Oolite and Muschelkalk.
"Principles of Geology" by Charles Lyell
In 1837 he took the degree of Ph.D. with a thesis on the Muschelkalk of Thuringia.
"Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 5" by Various