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  1. MarcoSr

    Petrified Wood Slabs

    I'm interested in petrified wood for the scientific value (wood where the cell structure is well preserved), for the aesthetic value (mineralized with vivid colors and crystal shapes), and for oddities (like fungus, insect borings etc.) contained in the wood. Below are three petrified wood slabs, from the United States, from my collection. The below individual slab pictures were taken with the slabs dry, indoors using my camera with flash. The close-up pictures were taken with my Dino-Lite digital microscope. If you want to see a lot more of the petrified wood pieces in my collection, check out my TFF thread at the below link: Petrified Wood, conifer, fungus Polyporites wardii, early Permian late Triassic 295 to 201 MYA, Chinle Formation, northern Arizona - 3.60 lbs. 10.5x8.75x0.53 inches Traditionally this petrified wood has been identified as Araucarioxylon arizonicum, a conifer tree. However,according to Wikipedia “ The validity of the name Araucarioxylon arizonicum has been questioned. A. arizonicum may actually be composed of several different genera and species. A 2007 study on the syntypes used by Knowlton in describing the species has revealed that they belonged to three species. They were tentatively reclassified as Pullisilvaxylon arizonicum, Pullisilvaxylon daughertii, and Chinleoxylon knowltonii. The genus Araucarioxylon may thus be superfluous and illegitimate; and the petrified logs of Petrified Forest National Park may be composed of a greater diversity than initially believed.” What makes this slab unique are the oval shaped patterns framing and permeating the piece, which are actually the fossil remains of a fungus (named Polyporites wardii), that invaded the ancient tree before it was fossilized. The fungus is preserved in barite (fungus is almost never seen because it doesn't preserve in silica the way wood does). Petrified Wood, Triassic 225 MYA, Chinle Formation near Holbrook, Arizona - 745g 160 x200x12mm This slab has incredible colors (purple, red, orange, yellow etc.) which is a major reason why Arizona petrified wood is highly desired by petrified wood collectors. Petrified Wood, early Eocene 50 MYA, Green River Formation, Blue Forest along ancient Lake Gosiute, Sweetwater County, Wyoming - 1.2 lbs. 8.5x6x.38 inches This slab has really nice wood preservation with a very well defined heart in the center and stunning wood grain. There is blue agate, with golden calcite filling some of the agate voids, some nice insect borings, as well as fossil ostracods near the rind. Per Viney 2020 The Blue Forest of Ancient Lake Gosiute Sweetwater County Wyoming “The lacustrine setting in which the silicified wood formed is contrasted with two geologic environments commonly associated with silicified wood deposits, trees transported by streams and rivers buried in fine-grained fluvial sediments of deltas and floodplains as well as lahars and ash produced from volcanic eruptions that bury trees. A recent scientific study of the Blue Forest fossil wood reveals that preservation occurred as a multistage mineralization process. The taphonomic sequence that included stromatolitic growth followed by wood desiccation and then exposure to mineral-laden waters is consistent with a playa-lake model for Lake Gosiute.” Marco Sr.
  2. My family and I went on a trip to Yellowstone, the Green River Formation and the Blue Forest in Wyoming. Although my son found by far the best Blue Forest specimen, I thought smaller specimens were also of interest. The attached image illustrates a common theme of the petrified wood specimens. Typically, the outer bark results in a fluffy white deposit of calcium carbonate. The inner bark is often composed of what the locals refer to as "blue opal" (likely chalcedony), and then the center part appears to be silicified wood. Some specimens had iron oxides as well. I highly recommend a trip to the Blue Forest. It is very out of the way and directions are hard to find. The directions we found at one point stated that we should turn left at the gravel road with a rusty barrel at the intersection. We traveled down the gravel road for many miles until we spotted dig sites. It is very remote and you would want to make sure you vehicle is in good condition with plenty of gas and that you have plenty of water.
  3. Putting a shout-out here to see if any members have any nice specimens of pet wood from the Blue Forest locality in SW Wyoming. A researcher in the paleobotany department of the Florida Museum (FLMNH) is doing research on the species that are found in this locality. She has already identified several specimens as palm and (interestingly) a species in the avocado family. She is presently searching for additional specimens to possibly widen the floral diversity of this site. https://www.mindat.org/loc-216297.html I gave away virtually all of my specimens that I collected back in 2009 and my remaining pieces are presently on display in Powell Hall (the public display museum) on campus (see below). If any members out there have some nice pieces from this locality that they might wish to offer up for research purposes I'd appreciate hearing from you. If you can PM me with some nice (higher resolution) clear images of your specimens I'll forward those on to the researcher to see if they appear to be useful for her research. Thanks in advance. Cheers. -Ken
  4. Hi everyone! Recently I bought this piece of blue petrified wood. In the process of cleaning, I have soak the whole piece in muriatic acid for about a day and half, and in water with baking soda for about 2 days to neutralize the acid. To my surprise the whole skin turn white and the dark blue part has turned much pale in color. I have attached a few photos below for your reference, please noted that when the whole piece is dry the white part is complete white and opaque, but when I added water, the white part became translucent. I am not sure if I have somehow damage it, or if I need to do more to remove this 'white skin'. I would appreciate anyone's advice on what is this white stuff, why adding water would change the opacity and what I should do next. Thank you. These are the photos when I first bought the petrified wood, note only the top part was cut and polished, no treatment done as yet This is after soaking in the muriatic acid for about a day and half, and in water with baking soda for 2 more days, the whole piece turned white, even the polished side change from dark blue to pale white brown color. This is after adding water, you can see the polish part has turn darker brow and the white part became translucent.
  5. minnbuckeye

    Prepping Wyoming Finds

    Prep help needed!!!!! 1. Blue Forest petrified wood. I have used a chisel and an engraver to remove most of the algal growth on the outside of the wood. Is there a chemical means to remove the fine stuff that remains without hurting the wood or the blue agate?? 2. Individual silicified shells of the fossil snail Goniobasis (Turritella Agate) found at Wamsutter, Wyoming. Again, is there a chemical way to remove the tan coating on many of these. Even if it took the shell away, I am most interested in preserving the beautiful silicified interiors of these shells. I have tried vinegar and potassium chloride with NO success. Thanks, Mike
  6. For those who enjoy solitude and quiet away from large crowds of people, visiting the Blue Forest of Wyoming is probably one of the best choices. I personally love the most remote places possible, so I enjoy Blue Forest but those of you accustomed to living in or near a busy city may find it unsettling (or so I've been told). It can get busy during the summer, but overall it tends to be pretty quiet especially the further away from the road you go. I was able to visit the site last month and I found some very cool things. The drive out to the site really isn't too long in my opinion, but it's really not a site to spend 20 minutes at expecting to find a lot of big logs. Most of the really big logs have been found, so a lot of patience and persistence can (but won't always) pay off. Let me just say that if you plan to dig, it gets pretty warm out there. You'll need to take breaks throughout the day and rehydrate if you aren't acclimated to the dry heat. There was no wind when I was there and only occasionally would a few clouds dot across the sky so don't count on shade being there unless you bring a canopy with you. The first couple days started off a bit lackluster as far as digging was concerned. I wasn't finding much by digging, but when I surface collected I found a lot of nice small pieces. Different people have different methods of searching for petrified wood here. Some dig blindly, some probe and then dig, some witch for petrified wood, some probe existing holes, and some just surface collect. Each method has its merits. There has been a lot of digging here over the years, so the landscape is dotted with holes all over, some of which have been filled (if you dig here, please refill your holes so BLM doesn't try to shut the site down). I was finding a lot of nice small pieces on the surface where other people had been digging, but I was hopeful of digging up my own log. I'd heard about a few other people finding some small logs when I was there, but most said the same thing: they'd all disentegrated when they tried to remove them. The petrified wood here can be pretty delicate. It is encased in layers of algae, but extracting the wood from the algae can be difficult and often results in separation of the agate layer from the wood or even the log splintering completely.
  7. Oxytropidoceras

    Fossil Wood Petrification and mineralogy

    Mustoe, G.E., 2015. Late Tertiary petrified wood from Nevada, USA: Evidence of multiple silicification pathways. Geosciences, 5(4), pp.286-309. https://www.mdpi.com/2076-3263/5/4/286 https://www.researchgate.net/publication/282851612_Late_Tertiary_Petrified_Wood_from_Nevada_USA_Evidence_of_Multiple_Silicification_Pathways https://sciprofiles.com/profile/112497 https://www.researchgate.net/profile/George_Mustoe Mustoe, G. and Acosta, M., 2016. Origin of petrified wood color. Geosciences, 6(2), no.25. https://www.mdpi.com/2076-3263/6/2/25 https://www.researchgate.net/publication/302497324_Origin_of_Petrified_Wood_Color Mustoe, G.E., 2017. Wood petrifaction: A new view of permineralization and replacement. Geosciences, 7(4), no.119. https://www.mdpi.com/2076-3263/7/4/119/htm https://pdfs.semanticscholar.org/4ff7/8f7c6899c4459c4f33e4d51c040f6374685d.pdf https://www.researchgate.net/publication/321170639_Wood_Petrifaction_A_New_View_of_Permineralization_and_Replacement Mustoe, G.E., 2018. Mineralogy of non-silicified fossil wood. Geosciences, 8(3), no.85. https://www.mdpi.com/2076-3263/8/3/85/htm https://www.researchgate.net/publication/323540027_Mineralogy_of_Non-Silicified_Fossil_Wood Mustoe, George E. "Non-mineralized fossil wood." Geosciences (8) no.223. https://www.mdpi.com/2076-3263/8/6/223 https://www.researchgate.net/publication/325827782_Non-mineralized_Fossil_Wood Luczaj, J.A., Leavitt, S.W., Csank, A.Z., Panyushkina, I.P. and Wright, W.E., 2018. Comment on “Non-Mineralized Fossil Wood” by George E. Mustoe (Geosciences, 2018). Geosciences, 8(12), no.462. https://www.mdpi.com/2076-3263/8/12/462/htm Mustoe, G.E., Viney, M. and Mills, J., 2019. Mineralogy of Eocene fossil wood from the “Blue Forest” locality, southwestern Wyoming, United States. Geosciences, 9(1), no.35. https://www.mdpi.com/2076-3263/9/1/35 https://www.researchgate.net/publication/330292211_Mineralogy_of_Eocene_Fossil_Wood_from_the_Blue_Forest_Locality_Southwestern_Wyoming_United_States Mustoe, G.E., 2015. Geologic History of Eocene Stonerose Fossil Beds, Republic, Washington, USA. Geosciences, 5(3), pp.243-263. https://www.mdpi.com/2076-3263/5/3/243 https://www.researchgate.net/publication/279786883_Geologic_History_of_Eocene_Stonerose_Fossil_Beds_Republic_Washington_USA Yours, Paul H.
  8. I_gotta_rock

    Blue Forest Fluorescent Petrified Wood

    From the album: Fluorescent Petrified Wood

    Petrified Wood viewed under short-wave ultraviolet light Eocene Blue Forest, Wyoming
  9. I_gotta_rock

    Blue Forest Fluorescent Petrified Wood

    From the album: Fluorescent Petrified Wood

    Petrified Wood viewed under short-wave ultraviolet light Eocene Blue Forest, Wyoming
  10. I_gotta_rock

    Blue Forest Fluorescent Petrified Wood

    From the album: Fluorescent Petrified Wood

    Petrified Wood viewed under short-wave ultraviolet light Eocene Blue Forest, Wyoming
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