 A brittle star fossil from Solnhofen limestone. | |
| Type | Geological formation |
| Age | Kimmeridgian[1] |
| Lithology | |
| Primary | Limestone |
| Location | |
The Solnhofen limestone is a Jurassic Konservat-Lagerstätte that preserves a rare assemblage of fossilized organisms, some of which, such as sea jellies, don't ordinarily fossilize at all. Others, like the early bird Archaeopteryx are preserved in such detail that they are among the most famous and most beautiful fossils in the world. The Solnhofen beds lie in the German state of Bavaria, halfway between Nuremberg (Nürnberg) and Munich (München).
Paleoenvironment and preservation[]
During the Late Jurassic, this area was an archipelago at the edge of the Tethys Sea. This included placid lagoons that had limited access to the open sea and where salinity rose high enough that the resulting brine could not support life. Since the lowest water was devoid of oxygen, many ordinary scavengers were absent. Any organism that fell, drifted, or was washed into the lagoons from the ocean or the land became buried in soft carbonate mud. Thus, many delicate creatures avoided consumption by scavengers or being torn apart by currents. The wings of dragonflies, the imprints of stray feathers, and terrestrial plants that washed into the lagoons were all preserved. The fossils are not numerous, but some of them are spectacular, and their range gives a comprehensive picture of a local Jurassic ecosystem.
At times, the lagoons almost dried out, exposing sticky carbonate muds that trapped insects and even a few small dinosaurs. Over 600 species have been identified, including twenty-nine kinds of pterosaur ranging from the size of a sparrow to 1.2 m (4 ft) in length have been found.
The fine-grained texture of the mud silt forming the limestone from the Solnhofen area (which is composed mainly of the towns of Solnhofen and Eichstätt) is ideal for making lithographic plates, and extensive quarrying in the 19th century revealed many fossil finds, as commemorated in the name Archaeopteryx lithographica, all the specimens of which come from these deposits. The closest modern analogue to the Solnhofen conditions is said to be Orca Basin in the northern Gulf of Mexico, though that area is much deeper than the Solnhofn lagoons.[2]
Fauna[]
Birds and other dinosaurs[]
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Pterosaurs[]
| Pterosaurs of the Solnhofen Formation | ||||
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Invertrebrate paleofauna[]
Crinoids[]
| Crinoids of the Solnhofen Formation | ||||
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See also[]
- List of fossil sites (with link directory)
- List of types of limestone
- List of dinosaur-bearing rock formations
References[]
- ^ a b c d e f g h i j k l m Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Jurassic, Europe)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 545–549. ISBN 0-520-24209-2.
- ^ Bartell K.W., Swinburne N.H.M. and Conway-Morris S. 1990. Solnhofen: a study in Mesozoic palaeontology. Cambridge (transl. and revised from Bartel K.W. 1978. Ein Blick in die Erdgeschichte. Ott.
- ^ a b c d e f g h "Scaphognathus." In: Cranfield, Ingrid (ed.). The Illustrated Directory of Dinosaurs and Other Prehistoric Creatures. London: Salamander Books, Ltd. Pp. 308-309.
- ^ a b c [1]