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My 2nd rock that I found in Esk, Qld, Australia. I have had this piece for a while and no luck in IDing it. The rock is about 10cm long with a raised impression along the entire length. It’s quite heavy too. Any help to ID this would be extremely appreciated

Hello everyone I’m new to this forum. My name is Tom, I’ve been collecting crystal rocks and fossils from the dessert area of Egypt, Sinai & southern Israel since the 1990’s. The one pictured here was recovered long time ago, It was 80 meters into the ground while digging in Granit rocks (construction in the middle of the desert..) I don’t know much about this and would love to to hear from the experts. I have so many fossils that I don’t know anything about, I’m planning to sell some to fund my college 2nd degree, so any info will be great. I’m very happy I found this forum Thanks in advance and I wish you all great day. Tom.

Over the last few years, I have made some rectangular polished slabs of fossiliferous rocks from Styria, Austria (Eastern Alps). It occurred to me, that I could try to arrange them in a somewhat stratigraphic order, spanning nearly exactly 400 million years. Numbering is from lower left to upper right, but I think, at least some of the fossils within these rocks can be recognized . I have posted also a map with the approximate locations of these rocks. Palaeozoic of Graz: 1: Orthocerates in dolomite, uppermost Silurian, Kötschberg-formation 2: Crinoid limestone, lower Devonian, Parmasegg-formation 3: Rugose coral and others in limestone, Eifelium, middle Devonian, Plabutsch-formation 4: Tabulate coral Favosites styriacus, Eifelium, middle Devonian, Plabutsch-formation Northern Calcareous Alps: 5: Hallstatt limestone with small ammonoids, upper Triassic 6: Hallstat limestone consisting of monotid bivalve shells (lumachelle), upper Triassic 7: Dachstein coral limestone, Rhaetian, upper Triassic 8: Crinoid limestone (Hierlatzkalk), lower Jurassic Upper Cretaceous Gosau group sorrowfully missing! Neogene basins: 9: Lumachelle consisting of Congeria bivalve shells, Miocene 9: Montastrea? coral colony, Miocene Enjoy! Franz Bernhard