GRD010WS0

W64-19a

Dolostone

Precambrian › Proterozoic › Neoproterozoic
542.0 - 1000.0

1

Ritter 154 › Cabinet 3 › Drawer C

pisolite,pisoids

Medium-sized pisoids composed of dark grey dolomite. W64-19a is distinct from W64-19. Original label: Pisolite dolomite. Beck Spring Fm., Pahrump Group. Late Precambrian. Float from wash. April 1964.

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California
1 mile southeast of Saratoga Springs, San Bernardino County
Latitude: 35.7°
Longitude: -116.4°

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Quartz core in a pisoid

2.5

plane

Quartz core in a pisoid

2.5

crossed

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scan

crossed

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scan

plane

GRD010WT0: Medium-sized pisoids composed of dark grey dolomite. A few pisoids have subrounded quartz at the cores. Poorly preserved sparrite cement. (C. Eichler)

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