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• Predominantly of shale, the Catalan Bay Shale Formation also contains thick units composed of either brown calcareous sandstone, soft shaly sandstone interbedded with bluish-black limestone, and interlayered greenish-gray marls and dark gray cherts.
• Highly deformed bedded cherts in Coron town, Busuanga (Lubos na naipit na mga batong tsert sa bayan ng Coron).
• The stratigraphy of the Southern Highland Rim is primarily composed of flat-lying limestones, dolomites, and shales, and to a much lesser extent, of cherts, siltstones, mudstones, and very fine grained to conglomeratic sandstones.
• Phosphatic sedimentary rocks are commonly accompanied by or interbedded with shales, cherts, limestone, dolomites and sometimes sandstone.
• This unit is made of sandstones, shales, cherts, metagraywackes, melanges, as well as mafic volcanics, and is mostly metamorphosed to blueschist and eclogite facies.
• The rocks of the suture zone consist of an ophiolite mélanges composed of Neotethys oceanic crustal flyschs and ophiolites; the Dras Volcanics: which are basalts, dacites and minor radiolarian cherts – the remains of a mid- to late Mesozoic volcanic island arc; and the Indus Molasse which are an Eocene or later continental clastic sediments.
• In the Indus Valley, sought-after materials included copper, gold, silver, tin, jasper and agate cherts, carnelian, azurite, lapis, fine shell, steatite, antimony, and ivory.
• In Carboniferous times deposition started with black shales and cherts from the Tournaisian age, and then red limestone, red shale and radiolarites were formed in the Visean age.
• The holotype specimen preserves 165 gastroliths composed of cherts and quartzites, the largest of which had an estimated weight of 9.
• This schist is the oldest formation in the region and is bordered on the south by the Tonzona Group composed of black slates and argillites, and the Tatina Group composed on black slates, argillites, greywackes, and interbedded limestones and cherts.
• Beneath this silt lies a polygenetic puddingstone dating from the Upper Eocene Age, mixed with varicoloured clays and small pebbles of rolled silex, Jurassic cherts and quartz grains.
• The Neoproterozoic West Congolian Supergroup occurs in the Nyanga syncline with feldspathic sediments overlain by dolomites, cherts and dolomitic limestone with stromatolites.
• Silica rich volcanic episodes in the region during deposition would have been needed for formation of the cherts, while slowly moving waters and gently subsiding terrains would be needed for the peats and fens to accumulate.
• The metamorphic rocks include garnet and clinopyroxene-bearing granulite, hornblende and plagioclase amphibolite, epidote, and greenschist facies sediments that include cherts, marbles, and quartzites.
• The Eibian lithic industry, previously known as the 'Doian' by Clark, is characterized by distinctive pressure-flaked tools like prismatic and single to multiple platform flake/blade cores, occasional Levallois and disc cores, small points, trihedral rods, microliths (backed pieces), scrapers and other retouched tools made on exotic cherts and local quartz, furthermore, BEAP excavations revealed that the Eibian industry is a pre-ceramic industry as it was associated exclusively with wild fauna.
• An ophiolite is a sequence of oceanic lithosphere that has been thrust on top of continental lithosphere and therefore has peridotites, gabbros and basaltic units overlain by cherts and submarine volcanic and sedimentary rocks.
• Six rock types were used in production of stone tools: volcanic tuff, silicified tuff, cherts, quartz aggregates, opals or chalcedonies, and rocks of effusive origin.
• The Pignola-Abriola section represents a portion of the Calcari con Selce Formation, a pelagic sequence of carbonatic and siliceous deposits (cherts and radiolarites) covering a period from late Ladinian to Hettangian.
• The gastropods themselves, particularly their faeces, have contributed to the silicification, more in particular to the formation of pelletoidal wackestone, that ultimately changed into cherts.
• In the Shoo Fly complex, the Bullpen Lake sequence has bedded cherts and cooled pillow lava that closely resembles rocks found on flat-topped offshore volcanic guyots, suggesting a deep-sea origin for the base of the Sierras sometime before the Devonian.

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