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Found 9 results

  1. Fossils Found In Creek

    Almost all your rocks have many nice external shell molds. Good eye! Cast or a mold fossil. Internal molds are fossilized replicas of the internal structure of an organism. ... Eventually the shell dissolves away, but the sediments have hardened and remain as a fossil. The difference in casts and molds lies in what happens when the shell dissolves away. External molds are imprints of just the shell. The last photo upper right corner looks like a brachiopod or an internal mold. This one looks like a Coquina. A sedimentary rock that is composed either wholly or almost entirely of the transported, abraded, and mechanically-sorted fragments of the shells of molluscs, trilobites, brachiopods, or other invertebrates.
  2. Trilobite ? and Coral ?

    I think what I am finding are "casts" of the trilo part. Many of the shells I find are a mold, and a cast with a thin void where the actual shell once resided. My understanding ...." The difference between a mold fossil and a cast fossil is that mold fossil is formed when an object is placed into soft mud and is removed by decomposition or physical sources; a cast fossil happens when a mold fossil fills up with sediment ." Thanks again, keep scratching .
  3. Trying to ID this type of fossil

    Forgive my ignorance. What would be the difference between mold and cast? This is really interesting to me, and my dad would have really loved to know.
  4. What!?

    There is much confusion in both the lay and sometimes the professional paleontology community as to the proper definitions of cast, mold and endocast. I wish that the term "endocast" had never been invented because of the confusion that it causes. An endocast is a term of art that means: an interior mold of the braincase or skull. A brain cast in not a synonym of an endocast even though they look similar. I agree that we should not be overly critical of the seller. Hopefully the seller and the buyers know that it is not the actual fossilized brain. Someone could educate the seller about the difference. After all, we at the Fossil Forum try to civilly argue points and educate others without harsh criticism or confrontation.
  5. Fossil Casts and Molds

    This graphic chart of molds and casts is a mess. I wonder if this was translated from another language, because the language of the key is stew of terms. Some of the attempted distinctions are just confused. For example, the author makes a distinction where there is no appreciable difference between: "K" which is equivalent to "D", or "J" which is equivalent to "E", or "C" which is equivalent to "I". The distinction between cast and mold is ignored in order to distinguish between diagenetic processes. In elucidating the difference in processes, he has muddled the language. He asserts that "K" is a "natural cast" of the exterior of the shell, while "R" is simply "a replica" of the original shell surface. Huh? He asserts that "H" represents a shell that is in-filled and then buried . . . That's the reverse of the sequence. That's one of the reasons I suspect that this is a translation. The graphic itself may be a source of the problem with the language. The graphic certainly requires a key; but, a single flow-chart requires a single key with terms that serve to distinguish one state from another. Thus the confusion of language. A translator may have struggled mightily with this key. Here's what I think some of these conditions should be labeled: "J" is an internal cast. "R" is an external cast. "E" is an internal cast.
  6. Terms and jargon a beginner should know.

    May I suggest learning the difference between a mold, cast, & clast, "Leaverite" & keeper, Stromatolite & coral. Just to start.
  7. Another First For Me From Austin Chalk - But What Is It?

    The difference between line spacing is whether you're seeing ribs or sutures. On cephalopods with thicker shells the ribs show more prominately on the outside surface like on an external cast. When you see the wider spacing it's the sutures from an internal mold, Some (lucky) times a fossil will have both, with either translucent shell you can see sutures through or cast shell broken away on part of the specimen showing sutures underneath. Nice 'loid!
  8. Newst Addition To My Collection.

    Thank you. I won it on ebay from trhourglass (seller name) or you can just type Allosaurus skull in the search and his will show up. He has several cast skull types and he has added a VERY cool Coelecanth Fish replica. A word of advice. If you decide you want one and can be patient, he is inconsistant with his starting bid price and it varies week to week with at least a $50 difference. I waited for over a month to bid and got it at the opening price. Quality wise. I would give it a very high B or a low A. It appears he has probably poured quite a few casts from the same mold and it no longer has quite as much detail as his stock photos. Overall though, I was very pleased and have no problem recomending him. I have done a bit of mold and cast work myself over the years as a taxidermist and the more casts you poor from the same mold you do tend to sacrifice some finer details over time. Still a very nice conversation piece.
  9. There is still a very distinct difference between a steinkern and a "cast" fossil. The steinkern is a cast of the original "interior" of the animal. But a cast will be of the exterior. I have collected many a fossil from the Devonian in NY & PA where the fossil is a perfect cast of the exterior of the animal with very fine detail. But there is no "shell" material. The cast is made from exactly the same mud as the surrounding rock. What is amazing to me is that the original animal had to have dissolved away completely, left behind a "mold" sturdy/crisp enough to hold the detail and then still allowed some sort of infiltration of fine sediment to fill the void. Then of course there are all kinds of fossils preserved somewhere in between. I have attempted to read books on taphonomy and it just makes my brain hurt. So going back to steinkerns covered in other fossils: Were they buried, fossilized, shell(mineralized or not) then dissolved away, then re-exposed on the bottom of the sea before being colonized, and then later reburied awaiting one of us folks to drag them home? How much time could that represent? 100s, 1000s, Millions? I think contemplating the Mobius strip is easier...
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