GRD02BQS0
110-CH5
Chert
Mesozoic › Jurassic
145.5
-
201.6
7
Ritter 154 › Cabinet 18 › Drawer N
radiolarians
Purple and red chert with green coloration along fractures. Beautiful conchoidal fracture. 7 thin sectons, all similar to one another with abundant radiolarians. Good teaching sample. Billets. Original label: Chert. Franciscan Formation.
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California
Samuels Springs
Latitude: 38.60407°
Longitude: -122.31219°
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Slide 1: Dark layer.
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plane
Slide 1: Dark layer.
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Slide 1: Light layer. Note the higher abundance of radiolarians.
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plane
Slide 1: Light layer. Note the higher abundance of radiolarians.
2.5
crossed
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Slide 2
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Slide 3
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Slide 4
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Slide 5
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Slide 6
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Slide 7
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GRD02BQT0: Slide 1: Abundant well-preserved radiolarians (~ 30%). Some foraminifera in the light red layer. Occasional pellets in the deep red layer. The green veins are silicic. (C. Eichler)
GRD02BQT1: Slide 2: Abundant well-preserved radiolarians (~ 30%). Some foraminifera in the light red layer. Occasional pellets and opaques in the deep red layer. The green veins contain minor amount of opaques. (C. Eichler)
GRD02BQT2: Slide 3: Abundant well-preserved radiolarians (~ 30%). Some foraminifera and pellets. The veins are silicic. (C. Eichler)
GRD02BQT3: Slide 4: Abundant well-preserved radiolarians (~ 30%). Some foraminifera in the light red layer. Trace opaques throughout the thin section. The green veins contain minor amount of opaques. The radiolarians are slightly more abundant in the light red layer than in the dark red layer. (C. Eichler)
GRD02BQT4: Slide 5: Entire thin section is composed of the dark red layer. The radiolarians are not as well preserved or as abundant (~15%) in this thin section as compared to the others. (C. Eichler)
GRD02BQT5: Slide 6: Abundant well-preserved radiolarians (~ 30%) and some foraminifera. Appears to be mostly composed of the light red layer. Trace opaques in the green veins. (C. Eichler)
GRD02BQT6: Slide 7: Abundant well-preserved radiolarians (~ 30%). Some foraminifera in the light red layer. Trace opaques throughout the thin section. The green veins contain minor amount of opaques. The radiolarians are slightly more abundant in the light red layer than in the dark red layer. (C. Eichler)
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