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

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40 Fig. 20. Profiles of Triassic-Jurassic boundary sequences from Steinplatte localities: Plattenkogel hill (locality S1) and “Fischer’s Coral Garden” (locality S2). Numbers of layers/samples correspond with Figs. 21 + 43. Some of the layers display ferromangenese impregnations in small cavities of probably biogenous origin (Pl. 17C). Similar to the base of the clastic sequence, reworked and corroded clasts of a Pecten-lumachelle layer were found at the edge of the depression. The clasts are often covered by black to brown goethite crusts that consist of thin and curly laminae, alternating with 25-100 µm thick sedimentary layers. They grew in cauliflower-like to digitate structures of up to 5 mm thickness (Pl. 17F). From the crust surface black tree-like “Frutexites” structures protude non-geopetally into the surrounding sediment (Pl. 17G). Finally the whole clastic sequence in the sink hole as well as parts of the Triassic reef limestone are discordantly overlain by a conspicuous spiculite layer up to 80 cm in thickness pinching out laterally after a few meters. It is red to pink colored and pervaded by a network of “white” spar-filled stromatactis cavities. Due to the very similar facies that is known from the Adnet reef slope near Hallein, the sponge- stromatactis-biomicrites should also be attributed to the Schnöll-Formation (Böhm et al. 1999) instead to the Hierlatz Facies, as it has been assumed by Mazzullo et al. (1990) who focussed their studies on the cements of the cavities. Stable isotopes of this horizon were measured also by Turnšek et al. (1999). As a new road-cut in summer 2003 has shown, the succession above the
Localities (Facies and Sponge Analyses) 41 spiculite continues with some red crinoidal limestones, where a few isolated sponges appear but spicular mats are absent. They are followed by the marmorea crust (zone of Schlotheimia marmorea), an ammonite-rich and condensed marker horizon that is best known from several quarries in the Northern Calcareous Alps. The Sinemurian Adnet Formation above belongs to the Lienbacher Member (zone of Arnioceras semicostatum). The Liassic sequence ends in red nodular breccias. � A first profile from this site was published by Rakús and Lobitzer (1993). Facies and Sponge Analyses: The facies at Steinplatte/Plattenkogel exhibit a benthic sponge community with more or less autochthonous individuals of mostly non-rigid species. In contrast to the fauna at Adnet/Rot- Grau-Schnöll Quarry, nearly all specimens at Steinplatte are highly collapsed. Investigations were focused on the taphonomy of the sponges and the origin of related stromatactis cavities. The results are given in chapter 5 and the following. 4.10.2. Fischer’s Coral Garden (CG) � Condensed red limestones that represent an advanced stage of Liassic onlap sedimentation were sampled from interstices of the Upper Rhaetian coral limestones (capping facies) at Steinplatte summit (TK25 / Blatt 8341 Seegatterl, R 45 4375, H 52 7415), called “Fischer’s Coral Garden” (locality S2, Fig. 20, 21). They are lacking sponge remains and presumably belong to the Adnet Limestone facies that is of Lower Sinemurian age. Fig. 21. Drawing of a thin section showing coralgal capping facies from “Fischer’s Coral Garden” (locality S2). Remaining space between coral framework is closed by a succession of Jurassic sediments and radiaxial fibrous cements. Numbers refer to layers in Fig. 20 + 43.
Page 1 and 2: Porifera-microbialites of the Lower
Page 3 and 4: Abstract In the aftermath of the Tr
Page 5 and 6: Zusammenfassung Nach dem Aussterbee
Page 7 and 8: Content 1. Introduction ...........
Page 9 and 10: Introduction 9 1. Introduction In U
Page 11 and 12: Geological Setting 11 2. Geological
Page 13 and 14: Geological Setting 13 Fig. 2. Locat
Page 15 and 16: Methods 15 3. Methods In the Rot-Gr
Page 17 and 18: Localities (Facies and Sponge Analy
Page 39: Localities (Facies and Sponge Analy
Page 51: Localities (Facies and Sponge Analy
Page 54 and 55: 54 and ferromanganese crusts. The b
Page 56 and 57: 56 5.1.1. The Sponge Fauna of the S
Page 58 and 59: 58 Skeleton: Lyssacinosid type with
Page 60 and 61: 60 Fig. 29a. Skeleton types and ass
Page 62 and 63: 62 new data from recent species to
Page 64 and 65: 64 sheltered by the adjacent sand d
Page 66 and 67: 66 In addition to the episodic sedi
Page 68 and 69: 68 found in the most condensed sect
Page 70 and 71: 70 5.2.1. The Sponge Fauna of the S
Page 72 and 73: 72 5.2.2. Diagenesis Sponge-dominat
Page 75 and 76: Fossil Record of Sponges 75 6. Foss
Page 77 and 78: Fossil Record of Sponges 77 Fig. 35
Page 83 and 84: Comparison with other Spiculites 83
Page 85: Comparison with other Spiculites 85
Page 88 and 89: 88 Hallam 1996; Hallam and Goodfell
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90 From the Lower Liassic Kendlbach
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92 At Steinplatte/Plattenkogel loca
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94 8.2. Major and Trace Elements We
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96 sediments. Due to this “contam
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98 significance of microbial involv
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100
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102 � The Lower Liassic sediments
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104 Böhm F (1992) Mikrofazies und
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106 Garrison RE, Fischer AG (1969)
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108 Krause FF, Scotese CR, Nieto C,
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110 Olsen PE, Kent DV, Sues H-D, Ko
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112 Schulze FE (1904) Hexactinellid
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114 Wendt J (1969) Stratigraphie un
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Plate 1 Glasenbachklamm - Lower Lia
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Plate 2 Mühlstein-South - Hornstei
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Plate 3 Sonntagkendlgraben - Flecke
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Plate 4 Hochgern - Liassic sediment
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Plate 5 Scheibelberg - Type locatio
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Plate 6 Luegwinkel - Liassic sedime
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Plate 7 Moosbergalm - Slope and bas
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Plate 8 Tannhauser Berg - Liassic s
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Plate 9 Adnet / Rot-Grau-Schnöll Q
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Plate 10 Adnet / Rot-Grau-Schnöll
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Plate 15 Adnet / Lienbacher Quarry
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Plate 16 Adnet / Eisenmann Quarry -
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Plate 17 Steinplatte / Plattenkogel
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Plate 21 Diapir of Murguia / Spain
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Plate 22 Arctic Vesterisbanken Seam
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Supplement 1.1 (datas to Fig. 42) -
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Supplement 1.2 (datas to Fig. 43 +
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Supplement 2. (datas to Fig. 47) -
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Supplement 3.2 (datas to Fig. 46) -
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Supplement 4. - Energy Dispersive X
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Supplement 6. - Register of Localit
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Steinplatte/Fischer’s Coral Garde
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Publications Parts of this study ar
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Curriculum Vitae Geboren in Bremerh
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