GRD00U1S0
S-688
Chert
Unknown
None
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2
Ritter 154 › Cabinet 18 › Drawer N
laminated
Grey laminated chert with silicified limestone nodules and small prismatic calcite rhombs
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Slide 1: Siliceous patch between limestone bed (bottom) and more-coarse limestone nodule (top)
5.0
plane
Slide 1: Siliceous patch between limestone bed (bottom) and more-coarse limestone nodule (top)
5.0
crossed
Slide 2: Prismatic calcite rhombs.
10.0
plane
Slide 2: Prismatic calcite rhombs
10.0
crossed
Slide 1: Note the more coarse-grained nodules in the center of the slide.
scan
crossed
Slide 1: Note the more coarse-grained nodules in the center of the slide.
scan
plane
Slide 2
scan
crossed
Slide 2
scan
plane
GRD00U1T0: Slide 1: Two silicified limestone beds and two limestone nodules surrounded by siliceous matrix. Small angular quartz grains and siliceous pockets in all limestones. Trace opaques in limestone beds, but not in the nodules. Limestone is cloudy. Perhaps recrystallized pelletal limestone? (C. Eichler)
GRD00U1T1: Slide 2: Cloudy calcite rhombs and opaques in silicic matrix. Rhombs become more abundant in the lower portion of the thin section. The rhombs are prismatic. (C. Eichler)
N/A
N/A