Porifera-microbialites of the Lower Liassic (Northern Calcareous ...

Plate 9
Adnet / Rot-Grau-Schnöll Quarry –
Outcrops of the Lower Liassic Schnöll Formation and locations of the two studied profiles.
(A): Location of the profile in the northeastern part of the quarry. Outcropping walls, about 5-
6 m in height, were cut by rope saws. The T/J boundary lies below the quarry floor.
(B): Quarry wall in the southwestern part, about 2.5 m in height. Red and grey limestones of the
Schnöll Formation overlay grey packstones of the Kendlbach Formation.
(C): Part of the SW profile, showing highly condensed Hettangian limestones. The basal
“sponge layer” of reworked material is overlain by a heterogenous sequence of
echinoderm-foraminifer-biomicrites, intercalated by sponge-rich horizons and several
erosional events. sp = sponge remnants on top of an eroded layer, nd = neptunian dike.
(D): Main part of the NE profile showing several sponge-rich layers (Langmoos Mb. and Lower
Guggen Mb.). Lighter circles and blotches refer to cross sections of the numerous tube- and
cup-shaped sponges. In the center, a layer with low content of sponges reveals the mottled
feature that reflects closely interwoven parts of well and less oxidized sediments. es =
erosional surfaces, ps = pressure solution.