Tag Archives: petrified wood

Jewelry by Tony Goldade

For the He-Man not afraid to wear jewelry, we have an assortment of petrified wood pendants with a rugged look to them.

For those with more delicate tastes, we have a selection of petrified wood pendants and earrings (mix and match!) in a beautiful assortment of rich browns, reds, and warm creamy stripes and swirls.  From dainty and small, to bold and beautiful, you can mix and match any pieces that strike your fancy.  All of the pieces here and more are available for sale.  Call us at 701-223-8359, or send an e-mail to goldade56 [at] hotmail.com

earring 1 earring 2 pendant 1 pendant 2 pendant 3 pendant 4

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Teredo-bored Petrified Wood

Teredo borings with woodgrain

Teredo borings with woodgrain

Teredo-bored petrified wood is North Dakota’s state fossil. It is found in 60 million year old Paleocene deposits, found in the southwestern area of the state. These are areas that were covered by the Cannonball Sea, now exposed at the surface. Before fossilizing, it was drift wood (ginkgo, bald cypress, metasequoia, etc.) that had been drilled (bored) into by small worm-like clams (Teredo), creating a Swiss-cheese effect.

Modern day example

Modern day example

Part of the fossilization included filling the borings with sediment or crystals, often seen as a different color or texture. If slabbed, the tiny clams can even be seen in cross section as little white crescents. The clams, also called shipworms, still pose a problem for wooden boats or docks today.

Borings with Teredo cross-sections

Borings with Teredo cross-sections

Teredo-bored petrified wood was adopted in 1967, and added to the Smithsonian Institution’s mineral collection. The selection was brought to the legislature by R. W. Carlson of Bismarck, former present of the Central Dakota Gem and Mineral Society, and H. A. Brady of Mandan. State Represenative W. G. Sanstead of Minot proposed the state fossil selection in House Bill 933.

Magnification of Teredo

Magnification of Teredo

https://www.dmr.nd.gov/ndgs/outofprint/NewsLetters/1993Spring.pdf (publication page 4 & 5)

http://ndstudies.gov/state_fossil

https://www.dmr.nd.gov/ndfossil/kids/FIND%20ISSUE%2011%20small.pdf