GRD019NS0
W79-79
Concretions
Mesozoic › Jurassic
145.5
-
201.6
1
Ritter 154 › Cabinet 18 › Drawer O
radiolarians
Black chert nodule in lenticular beds, dolomite rhombs turning into chert.
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
-
Italy
south of Lagonegro, Italy
Latitude: 40.12°
Longitude: 15.77°
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Radiolarians in micrite
5.0
plane
Radiolarians in micrite
5.0
crossed
Dolomite rhomb completely surrounded by radiolarians (chert)
5.0
plane
Dolomite rhomb completely surrounded by radiolarians (chert)
5.0
crossed
-
scan
crossed
-
scan
plane
GRD019NT0: Very radiolarian-rich. Dark micrite containing abundant poorly preserved radiolarians. Chert also contains many radiolarians, which are recyrstallized (those in the micrite are not as heavily recrystallized). Dolomite rhombs in the chert are being silicified. Neat thin section. (C. Eichler)
N/A
N/A