GRD019BS0
W79-67
Chert
Mesozoic › Jurassic
145.5
-
201.6
1
Ritter 154 › Cabinet 18 › Drawer O
laminated
Dark gray chert with white dolomite and zeolite veins. Individual dolomite crystals. Laminated. From a unit that grades from chert to argillite.
Samples W79-54 through W79-89 south of Lagonegro, Italy; all samples within the Jurassic Scisti silicei formation; see Winterer 1979 notebook, pages 34 through 41
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Italy
south of Lagonegro
Latitude: 40.12°
Longitude: 15.77°
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Dark clay bed between two cryptocrystalline quartz beds
2.5
plane
-
2.5
crossed
-
scan
crossed
-
scan
plane
GRD019BT0: Laminated grey chert and silficied clay. A large portion of the slide is cryptocrystalline quartz that grades to silicified clay. 15% opaque crystals and 30% poorly preserved radiolarians in clay. Thin dolomite veins. Occasional very small dolomite rhombs. Corner of thin section is sharp. (C. Eichler)
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