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Osmussaar Breccia

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Journal Article
Journal: GSA Bulletin
Published: 01 July 2010
GSA Bulletin (2010) 122 (7-8): 1039–1046.
...Carl Alwmark; Birger Schmitz; Kalle Kirsimäe Abstract The Middle Ordovician (466 Ma) Osmussaar breccia, situated along the northwestern coast of Estonia, is rich in angular chromite grains of extraterrestrial origin (>13 grains kg −1 ) and shocked quartz. The angularity of the chromite grains...
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(A) Part of sample OS1 of the gray sandstone of the <span class="search-highlight">Osmussaar</span> <span class="search-highlight">breccia</span>. (B) ...
Published: 01 July 2010
Figure 3. (A) Part of sample OS1 of the gray sandstone of the Osmussaar breccia. (B) Sample NS1 from the Neugrund impact structure.
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Roundness of the chromium-rich spinels in OS1 of the <span class="search-highlight">Osmussaar</span> <span class="search-highlight">breccia</span>. EC ...
Published: 01 July 2010
Figure 4. Roundness of the chromium-rich spinels in OS1 of the Osmussaar breccia. EC grains—chromium-rich spinels with a composition indicating an extraterrestrial chondritic origin. OC grains—other chromium-rich spinels.
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(A) Map of the Baltic Sea and the location of <span class="search-highlight">Osmussaar</span> Island. Circles rep...
Published: 01 July 2010
Figure 1. (A) Map of the Baltic Sea and the location of Osmussaar Island. Circles represent impact craters. (B) Close-up of the rectangular area in A. Simplified geological map of northwestern Estonia and the distribution of the Osmussaar breccia. The northern margin of the brecciated beds
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AVERAGE ELEMENT CONCENTRATION (WT% AND STANDARD DEVIATION [1σ]) AND THE HIG...
Published: 01 July 2010
TABLE 1. AVERAGE ELEMENT CONCENTRATION (WT% AND STANDARD DEVIATION [1σ]) AND THE HIGHEST (MAX.) AND LOWEST (MIN.) CONCENTRATIONS IN THE DIFFERENT GROUPS OF CHROMITES AND CHROMIUM-RICH SPINELS FROM SAMPLE OS1 OF THE OSMUSSAAR BRECCIA AND NS1 FROM THE NEUGRUND IMPACT STRUCTURE
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Backscattered electron images. (A) EC grain from sample OS1 of the Osmussaa...
Published: 01 July 2010
Figure 6. Backscattered electron images. (A) EC grain from sample OS1 of the Osmussaar breccia with rounded olivine inclusion. (EC grains—chromium-rich spinels with a composition indicating an extraterrestrial chondritic origin.) (B) Close-up of A. The alteration rim consists of iron oxide
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Schematic stratigraphy of Lower and Middle Ordovician sedimentary sequence ...
Published: 01 July 2010
—organic-rich shale, 3—claystone, 4—green glauconitic sandstone, 5—glauconitic dolomitized limestone, 6—sandy limestone, 7—oolitic limestone, 8—limestone, 9—Osmussaar breccia.
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Simplified scheme of the Cambrian and Ordovician of Baltoscandia with strat...
Published: 01 July 2010
Figure 8. Simplified scheme of the Cambrian and Ordovician of Baltoscandia with stratigraphic position of impact craters, Kinnekulle meteorites, and Osmussaar breccia. Age, global standard, and IGCP410 time slices are from Webby et al. (2004) . Biostratigraphy zones are according to Mens
Journal Article
Published: 01 November 2004
Geological Magazine (2004) 141 (6): 745–746.
.... Although shocked quartz in the deposit is proof of an impact origin, iridium levels do not clearly indicate an extraterrestrial component. Finally, Suuroja et al . describe the Ordovician (~475 Ma) Osmussaar Breccia covering an area of 5000 km 2 in Estonia. This breccia cannot be linked with any known...
Journal Article
Published: 01 May 2022
Journal of Paleontology (2022) 96 (3): 715–728.
... by dolomite intraclasts in the depressions, followed by a dolomitized microbial laminite that passes laterally to a breccia of angular laminite clasts. The Reptamsassia -bearing bed is ~4 m above the Boat Harbour disconformity marking the base of the Barbace Cove Member of the Boat Harbour Formation, and ~47...
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