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Found 15 results


    I have some, what I believe to be, calcareous tufa. I will be posting photos of different specimens over multiple posts and days. All specimens are in partially composed of botryoidal chalcedony. My main question has to with the fact that botryoidal chalcedony is a known pseudomorph in marine fossils. Many of my specimens look like they could be stromatolite-ish or algae-like. Does anyone have knowledge or experience with botryoidal chalcedony and its association with fossils? Can stromatolites or algae sediments become pseudomorphed into botryoidal chalcedony? The calcareous tufa rock that I will post in this message is definitely fossiliferous. You can plainly see three small marine fossils on the bottom-side of the fossil (What might they be?). Two are casts and one is a mold. Generally this rock is "bowl-shaped" overall with a convex top and a concave underside. The rock's top surface is covered with botryoidal chalcedony. There is a smaller amount of botryoidal chalcedony on the underside. Could the botryoidal chalcedony be a psuedomorph fossil? The first photo (#1) shows the rock's upper-side; The second photo (#1B) shows the underside; The third and fourth photos (#1C & 1C-2) are the same fossil object (cast, about 0.5 mm): The fifth and sixth photos (#1D-1 & 1D-2) are the same fossil object (cast, about 1 mm): The seventh and eighth photos (#1E-1 & 1E-2) are the same fossil (mold, about 1.5mm):
  2. A fossil hunt for. . . geodes?

    Sometimes, when you go on a fossil hunt, you find more than just fossils. Some friends and I traveled to southeastern Iowa in Spring '18 to scour the Mississippian for fossils, but while there, we noticed that many of the homes that we drove by sported geodes in their front yards. Intrigued, we decided to investigate for ourselves. As it turns out, the area is well-known for its geodes (Iowa's state rock is the geode), so we promptly decided that we had to collect some for ourselves. We eventually found a privately owned piece of property where we could fill a bucket with geodes for about $20, descended upon a stream cutting into the bedrock, and filled a bucket in short order. Then, on a return trip to Iowa a month later, we found another outcrop of geodes along the Mississippi River. Once again, we collected handfuls. Then, once we got back, we split them with a geode cracker. They varied in quality; some were stunningly beautiful, and others were less so. They were filled with all manner of minerals: some had chalcedony fillings; others had quartz crystals, and still others had minerals that I didn't recognize. The colors varied, too: pink, white, light blue, red, and brown. As it turns out, we were a little overzealous in our efforts; we collected about 50 pounds of rocks. We've given them away to as many friends would like them and have only just now run out of them a year later. Pictured below is a fraction of the haul. If you happen to find yourself in this neck of the woods, then remember: the Osagean of Iowa and Illinois has more than just crinoids. If you would like more information on them, where you can hunt for them, or even the annual Geode Fest, then check out this link. http://keokukiowatourism.org/geodes/index.php
  3. Hello all! I am new to this forum and just started getting interested in rocks and fossils. I went out to Wyoming last weekend and found a lot of really nice agates and fluorescent minerals but I also came across what look like some pieces of chalcedony with these white tubular inclusions in them. I first just saw the shell imprint in the rock so I pocketed it, but later when I looked closer noticed the white webbed tubes. I posted these pictures on reddit in r/fossilid and got a few responses telling me that they are Bryozoans. I looked this up and it looks right to me! My question is this...all of the pictures of fossilized bryozoans I have seen look very traditional (in sedimentary rock). Is it usual to find them embedded in silicate like this? I cannot find one other example of this on the internet which makes me think that maybe this type of specimen is called by a different name and that I am just not searching for the right thing. Anyways, any help and insights would be much appreciated! I am going back out to Wyoming this weekend to search some more and would love to know exactly what it is I am looking for! Thanks in advance for any responses! Erik
  4. garage sale acquisitions

    I don't know if this is the best category to post this under, or should it go under 'Member Collections' as the items are now part of my collection... A week ago already (Saturday), a couple from the local rockhounds had a garage sale. I think much of the material belonged to the club as these folks had been hosting the club's workshop equipment and it was being moved out to a new place. They said "There are some fossils"... but couldn't say what kind. Unfortunately they couldn't tell me much about the locations, not being fossil people who are careful to record that sort of info. This is the same guy who told me where I might find the source of my possibly-local (Vancouver Island) trilobites that I posted some years ago. I tried pressing him for a clearer idea but I'm hampered by poor maps. I got a slightly better idea but everyone's telling me the gates are always closed now to these backcountry locations and the club looked into getting a key but found out it would cost $1000+ and whatever else. Very frustrating. How am I supposed to solve the mystery now?? Anyway, here's what I got. Nice little Glyptostrobus(?) frond. No location given but it looks like the kind of thing we find around here in our Upper Cretaceous Nanaimo Gp but the rock is a little different than what I'm familiar with. Nice specimen anyway.
  5. Its always Interesting

    The Peace River is a magic place, It always has surprises in store, even when I am finding little that is Spectacular!! Look at this selection found while hunting today. Some NICE Hemis, a flake from tool making, even a wild boar tusk (hollow inside and modern) and then The botryoidal translucent brown mineral growing on the fossil is chalcedony. Chalcedony often fills the empty spaces in fossils, especially wood and bone. Did I mention a calcified sea urchin spine .. NEAT !!! Even got 1 Meg (very 1st find of the day), and a couple of calcified Barnacles.... I have never found a calcified barnacle in 10 years of searching this river... I love the diversity of finds... something new i every sieve. And the water was cool and the sun was shining.
  6. BIO-logic or GEO-logic?

    Found this on a desert walk southwest of Tucson, Az. Cool find.....is it possibly some kind of fossil, perhaps a fossilized structure similar to septarian formations, or just a cool looking little rock? Thanks for any and all help.
  7. Crystal agate fossil?

    I found this today on the beach under a clay cliff, it is known for agate And chalcedony to be found on this beach, what would I call this, it looks like some sort of a bone maybe?
  8. A trip to Haute Normandie cretaceous cliffs ( The plasterers' balad ) - Part 1 During three days we travelled along the Haute Normandie coast. The area we ventured in is cretaceous : cenomanian (-99 MA), turonian (-93 MA) and coniacian (-89 MA), following the west to east dip. Day 1 : Antifer We met in Saint-Jouin de Bruneval, on the beach parking lot next to the oil terminal. We started the trip at 9 am, so we could hike quite far before the tide would stop us. Sky was shiny and quite fast the temperature started to rise. We mostly spent the morning looking for fossils in cenomanian boulders and chalcedonies among the peebles. We let the tide lock us and made a break for a picnic and a nap. Once the tide let us, we started again to look for fossils, under a scorching heat. At about 6 pm we made our way back to the cars. The beach which was empty in the morning was now overcrowded. We mostly found some irregular echinoids : crassiholaster and catopygus (some with a really nice preservation), some brachiopods, some bivalves (most fragile) (including nice rastellum) and 2 shark teeth. Here's a geoligical presentation of the area (in french unfortunately) http://craies.crihan.fr/?page_id=13478 Some of my finds on that day : heres a link a my flickr galery for the whole trip : https://www.flickr.com/photos/48637020@N06/albums/72157682540354264 Crassiholaster subglobosus Crassiholaster subglobosus Crassiholaster subglobosus with a smal bivalve print Catopygus colombarius more to come soon...
  9. Chould this stone be a fossilized toe bone of a big animal? The first photograph is top view, the second is flashless angled top view. We have a lot of Agatized and Partially Agatized Bones. They are translucent chalcedony. But this part is not chalcedony. It may be at the first stages of the fossilization.
  10. Coprolite or Chalcedony?

    I found what I thought was originally a giant superior agate. After cutting it and didn't see any fortification I labeled it common Chalcedony. Then I read an article about Coprolites in my Rock & Gem mag. and they had a carving that looked exactly like the inside of my.. what I thought was chalcedony. Being more of a rock guy than a fossil guy I thought I would try and get some expert advice on its identification. Here is why I think it might be coprolite. 1. superior agates are formed inside of basalt cavities and weathered out which leaves impressions on the outside.. (none I could find that looked like other agates) 2. there looks to be insect burrow holes like something may have bored in at one time and after it mineralized left a bit of druzy quartz in the burrow holes. (can only see with eye piece) 3. there is a slight flat spot like it had been sitting for some time undisturbed prior to mineralization. These were some of the things I read in the article that had me second guessing what I had found. I found the piece along a lake bank that had eroded a bit due to receding ice. This is in Buffalo, (Wright County) Minnesota. Thanks. one pic is whole, the rest I cut in half and polished one side to try and enhance the view on the inside.
  11. DSCN3022

    From the album Adventure is an individual thought!

    These are the most unusual chalcedony forms to find in the World. Here is one laid upon some pine needles. Some spots will have so many, you will have to pick only the most interesting ones! Have a collecting bag around your neck to put them into it. Have a walking stick to hike with, do some prodding in thick pine needles. We have seen some rattle snakes, actually one, but it was nearly five feet long a Basalt ridge. Just be aware. Wonderful camping. Well maintained roads. Gasoline, groceries and water to be found in Reserve. On a map draw a fifty mile circle and you are just beginning to find places to hunt. Most are to the north, east and west of Reserve. The locals will help you figure out where to begin.
  12. DSCN3021

    From the album Adventure is an individual thought!

    This is a typical flat to find loose chalcedony. There are areas of Basalt and Rhyolite that you will find the sources of all of the agate and chalcedony. Once you understand lava flows from the Oligocene volcanics... you are on your way to finding the most unusual chalcedony in the world. Step into a Forest Service Office, get the large scale Forest map(s) you need, inquire as to where a good area to begin looking might be... and you are on your way. Make sure you mark where you camped... so you can find it next time and finish looking over the beautiful hillsides.
  13. DSCN0799 1

    From the album Adventure is an individual thought!

    Have your dogs pack the water into the back country and pack the finds back to camp. There are so many areas to find agate and opal that you just find a nice camping spot and begin to prospect by walking... and walking... and walking. Even "Apache Tears" can be found north of Snow Lake. Bring a bag to carry them. These are the size of a dime to quarter. The dry creek beds and hillsides are a good place to start... north of Snow Lake are some nice camping spots and the hills further north have the Apache Tears washing out in the dirt roads!
  14. DSCN2457

    From the album Adventure is an individual thought!

    Reserve, New Mexico is the center hub of agate hunting. Luna, New Mexico. Apache Creek, New Mexico. A thousand square miles of the roughest terrain in New Mexico. Bring a GPS so you do not get lost. Go further south to Glenwood Springs and check out the mining districts. Silver City and the copper mines are not too far away. Visit the Gila Cliff Dwellings. Worth the drive.
  15. I finally made it back to one of the most beautiful places to look for one of my favorite fossils - Agatized Coral from the Tampa Bay area. I only had one evening and one morning to search and these are some of the smaller pieces that I have. I brought back about 50 pounds of beautiful corals- most of which I need to cut. Can't wait to see what is inside! If any of you have suggestions for cutting it properly I would love to hear your methods. We had a hammer with us but it became clear we were just shredding the coral. I am thinking of using a wet saw to get some clean cuts. If you are not familiar with it, this site does a nice job explaining it. http://raysrocksandgems.com/Withlacoochee_Coral.html