Filters: Tags: Oregon (X) > Types: OGC WMS Service (X) > partyWithName: Peck, D.L. (X)

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Spherulite-bearing ash flow, Jefferson County, Oregon. Album caption: Spherulite-bearing ash flow at the base of member F of the John Day Formation, exposed in the open pit of the Priday agate deposite. Chalcedony-filled spherulites (thunder-eggs) occur near the base of the ash flow. The excavation in shadow near the bottom of the photograph was dug in recovering the sperulites. Jerfferson County, Oregon. n.d. Published as figure 8 in U.S. Geological Survey.Bulletin 1161-D. 1964. Index Card: No index card. Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Oregon, Peck, D.L. Collection, Photographers, photo print Photomicrograph of a soda sanidine crystal partly rimmed by myrmekitic, Jefferson County, Oregon. Album caption: Photomicrograph of a soda sanidine crystal partly rimmed by myrmekitic intergrowths of quartz and sanidine; the crystal is a devitrified rhyolite welded ash-flow sheet of the John Day Formation (member G) near Willowdale, Oregon. Jefferson County, Oregon. n.d. Published as figure 4 in U.S. Geoloical Survey. Bulletin 1161-D. 1964. Index card: No index card. Categories: Image; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Oregon, Peck, D.L. Collection, Photographers, photo print