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"Fossil ball" - Campanian St. Bartholomä-formation, Gosau group, Eastern Alps
FranzBernhard posted a topic in Fossil ID
This time a really odd ball from St. Bartholomä, Styria, Austria (West of Kalchberg, point 36). Collected 04/09/2019. Campanian St. Bartholomä-formation, Gosau group, Eastern Alps. The specimen was very dirty, thought it is just a round and smooth limestone piece, but haven´t found such a smooth piece there before, so I took it with me. After cleaning (but without any prep) and inspecting with a hand lens, I discovered, that the subglobular specimen of about 7 cm in size is covered over and over with tiny polygons, about 0.1-0.2 mm in size. So it is a fossil! But what? It seems to have two natural openings, a larger on (pic A) and a smaller one (pic B), with polygons all over the rims and also inside the rim of the opening (pic F). At the lower right corner of pic F you can see, that the polygons are in reality prismatic structures. Polygons are also covering large parts of the inside of the two openings. The prismatic structures can also be seen in some dimples caused by pressure solution. Any hints and suggestions are welcome! Many thanks! Franz Bernhard- 15 replies
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Fossil hunting in the Geistthal-formation (Santonian - lower Campanian), Gosau basin of Kainach, Styria, Austria
FranzBernhard posted a topic in Fossil Hunting Trips
Fossil hunting in the Santonian - lower Campanian Geistthal-formation of the Gosau basin of Kainach, Eastern Alps (Styria, Austria) As a whole, the Gosau basin of Kainach - St. Bartholomä is not very fossiliferous. In contrast to the St. Bartholomä-formation with its rudists etc., the other, much more extensive formations, especially the very extensive, somewhat tubititic Afling-formation, are generally very poor in fossils. Some are known, eg. ammonites, but their occurrences are rather elusive. One exception - or at least in part - are Trochactaeon snails. They are known since the beginning of geological documentation of the area (around 1850), but only as loose pieces. It took until about the 1960ies for the first finds of this snails in outcrops. However, only a few sentences were (repeatedly) published since then, only a list of the species is given (without any description), and also no detailed description of the occurrences and their exact locations. That´s the sad side. The good side is: There is at least one (permanent) occurrence of this snails in an outcrop at a major road! This occurrence is at the red X... Part of Geofast-map (left, squares are 2x2 km) and geological overview from Ebner (2000) (right). There seems to be not much correspondence between these maps. For orientation, see village Geistthal in upper part of both maps. ...and it is featured in an excursion guide from 2015 (from Hubmann & Gross, 2015): The snails are located in the upper part of the Geistthal-formation, a succession of gray conglomerates, sandstones and siltstones with very occasional thin coal layers and thin beds of calcareous onkoids. The lower part of the Geistthal-formation is a coarse-grained, red conglomerate; its the basal formation of the Gosau basin of Kainach. I have visited this outcrop in December 2015, and yes, the snails are still there. -
Chonetid impressions in slate - Devonian Plabutsch-formation, Palaeozoic of Graz, Styria, Austria
FranzBernhard posted a topic in Fossil Hunting Trips
Chonetid impressions in slate (“Chonetenschiefer”) from the Plabutsch-formation, Palaeozoic of Graz, Styria, Austria (Devonian – Eifelian) The classic occurrence at Gaisbergsattel, west of Graz The Eifelian Plabutsch-formation – mostly fossiliferous limestones – of the Palaeozoic of Graz, Styria, Austria, contains locally beds of slates of various colors. Some of these beds contain abundant limonitic imprints of brachiopods and bivalves (“Chonetenschiefer”). The locality first mentioned in the literature (1871) is that at Gaisbergsattel west of Graz: Austrian map with "classic" occurrence of “Chonetenschiefer” at Gaisbergsattel (red x). Part of geological map of Kuntschnig (1937) with “Chonetenschiefer” between the two red x east of Gaisbergsattel. Here, the slate layer is up to 2 m thick, grey like mice and splits easily in flat pieces (Hanselmayer, 1957). The fauna was first listed in Heritsch (1935): Chonetes subquadrata Chonetes sarcinulata Chonetes oblonga Chonetes nova species (most abundant!) Spirifer aculeatus Pterinea fasciculata Pterinea cf. bifida Pterinea cf. costata More than 10 years ago, my first attempt looking for these rocks was not successful. A few days ago (03/29/2019), however, I stumbled over this rock by pure serendipity. A small piece of it was lying on a rather busy hiking trail (“Mariazeller Weg 06”) east of Gaisbergsattel. Relief map with my first find of “Chonetenschiefer” at the hiking trail (red x) and supposed outcrop area of this rock after the geologic map of Kuntschnig (1937). Hiking trail “Mariazeller Weg 06”, where I found my first specimen. Pic from 04/01/2019. I was able to split the rock with my fingernail – and there they were, the limonitic brachiopod imprints! A faint radial ripping is visible. No other specimen was found on the trail. Now I looked closely at the geologic map, the text of Hanselmayer (1957), and the relief map and decided to explore the area around the red line (see above), where the outcrop of this rock is supposed to be. It’s a forested area with dense undergrowth, among the undergrowth many spiky blackberry bushes… No outcrop was found, but fallen trees have exposed some rock fragments: Abundant limestones, light brownish slates and, yes, some grey slate, mostly small pieces. I split only the largest of them – and again some brachiopod imprints were found...- 8 replies
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From the album: Hippurites colliciatus Woodward, 1855 from St. Bartholomä, Styria, Austria
West of Kalchberg, point 36, collected 03/17/2019. -
From the album: Hippurites colliciatus Woodward, 1855 (Pseudocolonies) from St. Bartholomä, Styria, Austria
West of Kalchberg, point 36, collected 03/17/2019. -
Coral (6) from the Campanian St. Bartholomä formation, Styria, Austria (Gosau group, Eastern Alps)
FranzBernhard posted a topic in Fossil ID
Hello, here is the next coral colony from the Campanian St. Bartholomä-formation in Styria, Austria (Gosau-group), collected 02/10/2019, west of Kalchberg, point 36. This coral colony is intergrown with limestone. There is a naturally weathered cross section and naturally weathered vertical section (but not much to see there). I have cut and polished one end and preservation seems to be not too bad. However, as usual, am rather clueless. I think, it has external pali, so it could belong to Hydnophoropsis? Many thanks for your help! Franz Bernhard -
From the album: Hippurites nabresinensis Futterer, 1893 from St. Bartholomä, Styria, Austria
East of Kalchberg, point 25, collected 02/27/2019. Crushed specimen with various sediment infill and quite nice contrast. -
From the album: Vaccinites vesiculosus (Woodward, 1855) from St. Bartholomä, Styria, Austria
East of Kalchberg, point 30, collected 08/23/2017. Long, but incomplete specimen with various sediment infill. L-pillar is broken off and displaced in most sections. -
From the album: Vaccinites vesiculosus (Woodward, 1855) from St. Bartholomä, Styria, Austria
West of Kalchberg, point 36, collected 02/10/2019. Serial section of the upper part of a relatively large V. vesiculosus. AN4152 is about 15 mm from commisure; parts of the left (upper) valve are preserved. -
From the album: Hippurites colliciatus Woodward, 1855 (with radiolitid rudists) from St. Bartholomä, Styria, Austria
East of Kalchberg, point 25, collected 08/04/2018. -
From the album: Hippurites colliciatus Woodward, 1855 (with radiolitid rudists) from St. Bartholomä, Styria, Austria
East of Kalchberg, point 25, collected 06/03/2018. -
From the album: Hippurites colliciatus Woodward, 1855 (with radiolitid rudists) from St. Bartholomä, Styria, Austria
East of Kalchberg, point 25, collected 02/18/2018. -
From the album: Hippurites colliciatus Woodward, 1855 (with radiolitid rudists) from St. Bartholomä, Styria, Austria
East of Kalchberg, point 25, collected 10/26/2017. -
From the album: Hippurites colliciatus Woodward, 1855 (with radiolitid rudists) from St. Bartholomä, Styria, Austria
Northeast of Kreuzegg, point 9, 10/08/2017. -
From the album: Hippurites colliciatus Woodward, 1855 (Pseudocolonies) from St. Bartholomä, Styria, Austria
West of Kalchberg, point 36, collected 01/01/2019. -
From the album: Hippurites colliciatus Woodward, 1855 (Pseudocolonies) from St. Bartholomä, Styria, Austria
East of Kalchberg, point 25, collected 08/12/2018. -
From the album: Hippurites colliciatus Woodward, 1855 (Pseudocolonies) from St. Bartholomä, Styria, Austria
East of Kalchberg, point 38, collected 05/30/2018. Small, cylindrical individuals, not sure of species. -
From the album: Hippurites colliciatus Woodward, 1855 (Pseudocolonies) from St. Bartholomä, Styria, Austria
East of Kalchberg, point 38, collected 06/15/2018. -
From the album: Hippurites colliciatus Woodward, 1855 (Pseudocolonies) from St. Bartholomä, Styria, Austria
East of Kalchberg, point 25, 01/20/2018. Not totally sure of the species. -
From the album: Hippurites colliciatus Woodward, 1855 (Pseudocolonies) from St. Bartholomä, Styria, Austria
West of Kalchberg, point 32, collected 10/25/2017. -
From the album: Hippurites colliciatus Woodward, 1855 (Pseudocolonies) from St. Bartholomä, Styria, Austria
East of Kalchberg, point 25, collected 08/13/2017. AN3861 is no longer in my collection. -
From the album: Hippurites colliciatus Woodward, 1855 from St. Bartholomä, Styria, Austria
West of Kalchberg, point 36, collected 02/10/2019. -
From the album: Hippurites colliciatus Woodward, 1855 from St. Bartholomä, Styria, Austria
East of Kalchberg, point 25, collected 12/27/2018. -
From the album: Hippurites colliciatus Woodward, 1855 from St. Bartholomä, Styria, Austria
West of Kalchberg, point 36, collected 11/05/2018. -
From the album: Hippurites colliciatus Woodward, 1855 from St. Bartholomä, Styria, Austria
East of Kalchberg, point 25, collected 07/08/2018. Pillars preserved as steinkerns, probably cut very near the commisure. To the lower right is a very small individual, perhaps of the same species.