NOTE: the fossil is been reassembled on a plate from the same layers, many Protrachyceras ammonite pieces and negative are present. The Crinoid's 'flowering' crown measures over 16cm across, and the length of this fossil - from the bottom of the stalk to the top of the arms - is over 28 cm. The Crinoid exhibits excellent detail, and the pyritized replacement of the fossil makes this a unique piece. Reassembled and embedded in rock, the gray background to this peaceful scene gives the impression that the Sea Lily is undulating in an ancient ocean. This specimen is beautifully displayed, well centered on the matrix with its double flowery crowns appearing as if in motion, while its stalk anchors the piece in place to the holdfast. Traumatocrinus hsui would filter food particles through its 'feather-like' arms then actively move the food towards its mouth using its tube feet and transport grooves.

PICTURES FROM OUR BOOTHS AT THE 42ND GEM AND MINERAL SHOW – NOV.This striking Crinoid fossil of the pelagic variety, attached itself to floating wood to feed off the organic-rich surface waters of the ocean.

60th ANNUAL GEM AND MINERAL SHOW WILL BE FEATURING TWO SPECIAL EXHIBITS FROM THE SHOW-ME ROCKHOUNDS OF KANSAS CITY.With the December meeting place to be announced. Thank you for stopping by / Merci pour votre visite Search Terms and conditions Privacy policy Shipping Refund. Our Regular meetings are held on the third Saturday of each month at 11:00 a.m. Members can email pictures of their work, rocks, cabs, slabs or finds, etc.

Impresive half cut Spitoiceras Ammonite mounted on a custom aluminum stand. As of March 14th, 2022 Masks are Optional at all Kansas City Libraries. Pyritized Spitoiceras Ammonite from Russia. October 15th, 2022 meeting starts at 11:00 AM – 1:00PM! The meeting will be held at the Waldo Branch of the Kansas City Public Library, Room A, 201 E 75th St. The bacteria change the sulphates into sulphides which can then diffuse with the iron into the trilobite or other organisms forming our spectacular fossils.ĪTTENTION!!! - OCTOBER 15TH MEETING TIME - 11:00 AM One of the final conditions for pyritization to occur is to have large numbers of sulphate reducing bacteria (they live in oxygen deficient water) and a high concentration of reactive iron. Another important condition was anaerobic seawater – the water was low in dissolved oxygen.įor the trilobites with soft body parts, rapid burial meant there was very little decay of the creature before the fossilization process began. In this case there would not be a lot of decaying material present. Research indicates that prehistoric animals that become pyritized, such as trilobites and ammonites, were rapidly buried under ocean sediments that were low in organic matter. Pyritized fossils tell us a lot about the past environments of our planet. Pyrite or “Fools Gold” is an iron sulphide that occasionally – under unique geochemical conditions – covers or replaces prehistoric creatures and plants, transforming them into incredible fossils with a gold-like lustre. How do pyritized ammonites form? I asked the Internet and here is what I found: This is a gorgeous, 3' wide, pyritized Deshayesites deshayesi ammonite fossil from the Lower Cretaceous deposits of Saratov, Russia. Here is a pyritized ammonite ( Cosmoceras spinosum) from the Jurassic period, found in Michaelov, Russia.

Pyritized ammonite