A Hidden World AwaitsTake a moment and gaze down the Greenhouse Portal, your entrance into vast underground spaces filled with an intriguing human and geologic history. What was once the ocean floor provided raw materials (silica sand) for glass making during the early twentieth century.
|Placed By||East Bay Regional Park District|
|Marker Condition||No reports yet|
|Date Added||Tuesday, April 5th, 2016 at 9:01am PDT -07:00|
|UTM (WGS84 Datum)||10S E 599671 N 4201423|
|Decimal Degrees||37.95495000, -121.86546667|
|Degrees and Decimal Minutes||N 37° 57.297', W 121° 51.928'|
|Degrees, Minutes and Seconds||37° 57' 17.82" N, 121° 51' 55.68" W|
|Driving Directions||Google Maps|
|Area Code(s)||925, 510, 415|
|Closest Postal Address||At or near Nortonville Rd, Pittsburg CA 94565, US|
|Alternative Maps||Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap|
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