Poorly sorted quartz/quartzite conglomerate with subsidiary lithic clasts. Lithic breccio-conglomerate with clasts of dolomitic marble, schist, and other predominantly metamorphic rocks. There is extensive intergrowth suturing about some marble/limestone clasts.īreccia delle Alpi, from the Alps or perhaps Breccia di Seravezza, from Seravezza, Lucca, Tuscany, Italy ![]() Polymict conglomerate with clasts of quartz, chert and silicified limestone. There is extensive brown filler.Ĭonglomerate, with igneous clasts showing altered margins, in limestone matrix with well-preserved microfauna. Polymict conglomerate of limestone pebbles, bordering on compact calcite travertine. Matrix is extensively spotted with Fe/Mn, with dendrites around rims of some clasts.īreccia di Torrita, from Torrita Tiberina, near Rome, Lazio, Italy Polymict conglomerate of diverse limestones and minor chert/chalcedony clasts, fairly well sorted and elongate with some alignment. Some show 'paesination' - microfracture constrained patterns of ironstaining like pietra paesina, and these also have a rich microfauna. These are predominantly limestone a few are red in colour. Polymict conglomerate with extensively fractured clasts. Matrix is white micrite/microcrystalline calcite. Green silicate grains are subhedral-euhedral crystals Well-rounded clasts have heavily altered rims. Polymict conglomerate of predominantly limestone pebbles, with abundant green silicate grains in matrix. Creamy-yellow micritic matrix with microfossils. ![]() Common larger benthic forams, scarcer calcareous algae. Note sutured/styloliitised clast boundaries. Polymict conglomerate with predominantly limestone clasts. Some darker grains are ?volcanic?, some is dendritic Mn but also some is brown filler.īreccia di Perugia, from Perugia, Umbria, Italy Some brown is goethite, but some is filler/polishing compound.Ĭalcarenite-polymict limestone conglomerate with clear spar matrix. ![]() Clasts are predominantly limestone, but some are dolomitic and some siliceous. Well-sorted quartz conglomerate with subsidiary lithic clasts. Lithic breccia-conglomerate with siliceous clasts. Metagabbro, the diopside and actinolite-tremolite both coloured bright green by trace chromium. Verde di Corsica, smaragdite, from near Orezza, Monte San Petrone, Haute-Corse, Corsica, France previous 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 next OUMNH number
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