<p>Sequoia sempervirens (Don in Lambert, 1824) - quartz- permineralized coast redwood tree trunks in the Pliocene of California, USA.
</p><p>The trees at this locality have also been identified as Sequoia langsdorfii.
</p><p>The Calistoga Petrified Forest has been called the best-anywhere petrified forest of Pliocene age.  The fossil wood here is preserved with the most common permineralization mineral - quartz.  The preservation of these trees was the result of burial by a rhyolitic volcanic ash-flow tuff of the Sonoma Volcanics (Upper Pliocene).  The volcanic tuff was erupted from a vent near modern-day Mt. St. Helena (= north of this locality).
</p><p>The fossil redwood trees here are nicknamed the "Ollie Bockee Trees".  [From park signage:] In memory of Ollie Bockee, who in 1914 purchased this property and by charging 50 cents admission, was able to pay geology students to uncover more trees to further develop the forest.
</p><p>Classification: Plantae, Pinophyta, Pinopsida Pinales, Cupressaceae
</p><p>Stratigraphy: Sonoma Volcanics, Upper Pliocene, 3.2 to 3.4 Ma
</p><p>Locality: Ollie Bockee Trees, Calistoga Petrified Forest, northern side of Petrified Forest Road, west-southwest of the town Calistoga, eastern Sonoma County, Coast Ranges of northwest-central California, USA
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<hr><p>See info. at:
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&lt;a href="<a class="external free" href="https://en.wikipedia.org/wiki/Petrified_Forest_(California)">https://en.wikipedia.org/wiki/Petrified_Forest_(California)</a>" rel="noreferrer nofollow"&gt;en.wikipedia.org/wiki/Petrified_Forest_(California)&lt;/a&gt;
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/47445767@N05">James St. John</a>
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/jsjgeology/49097877162/">Sequoia sempervirens (fossil redwood tree trunks) (Sonoma Volcanics, Upper Pliocene, 3.2 to 3.4 Ma; Calistoga Petrified Forest, Calistoga, California, USA) 86</a>