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John Christian commented on Lisa Lundgren‘s Fossil #013328 7 years, 6 months ago
7 years, 6 months ago7 years, 6 months agoI can’t tell species but S. subrugosa is the listed species in the Finis Shale.
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John Christian commented on Lisa Lundgren‘s Fossil #013313 7 years, 6 months ago
7 years, 6 months ago7 years, 6 months agoI don’t see very many, if any, spines. If spineless, this could be Lophophyllidium plummeri. See “The Color Guide To Pennsylvanian Fossils of North Texas” by McKinzie for a description and photos of both species.
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Good point! I was looking at a black and white copy of the McKenzie fossil guide that was handed out at the field trip. Sometimes, things get a little fuzzy. Could the protrusion on the top be a bryozoan? I can take another picture and add it tomorrow.
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I’d go with Lophophyllidium plummeri since I don’t see any spines. I can’t tell if there are any bryozoan on top.
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John Christian posted a new activity comment 7 years, 6 months ago
7 years, 6 months ago7 years, 6 months agoIf it is from the Finis Shale Member, it is most likely Pseudorthoceras knoxense (Girty, 1912) per: “The Color Guide To Pennsylvanian Fossils of North Texas” by McKinzie.
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Dr. Ronny Maik Leder and John Christian are now friends 7 years, 11 months ago
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John Christian replied to the topic 1. How to Log-in & Update your Profile in the forum Help Forum 8 years ago
8 years ago8 years agoHello,
Here’s an easy solution. Type your password into the username field. If it looks ok then cut it. Enter username then past password into password field. Easy.
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John Christian replied to the topic Mold, Cast and Steinkern in the forum What Is It? 8 years ago
8 years ago8 years agoThanks again Jack. @jkallmeyer
Since body fossils include molds and casts, using body fossil would not work in the definitions because according to 2 “: Molds can only be made against molds. (Not true.) What is the definition of: “A mold is an imprint of _______________? I could make up and define a new term of art such as “alpha fossil” to put…[Read more]
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John Christian replied to the topic Mold, Cast and Steinkern in the forum What Is It? 8 years ago
8 years ago8 years agoThank you Jack (and everyone else.) @jkallmeyer
You provided me a very helpful analysis that found the same two weaknesses that I was most concerned about.
If I substitute “body fossil” for “original fossil” will all the other definitions and rules make sense and create no major contradictions? I hope that a “body fossil” includes a cast because…[Read more]
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John Christian replied to the topic Mold, Cast and Steinkern in the forum What Is It? 8 years ago
8 years ago8 years ago@rleder, @bdattilo, @bmacfadden, @crobins, @rebecca-freeman, @jkallmeyer
Thanks for everyone’s help.
Using suggestions provided by you and information from other sources, I am creating a set of definitions and rules to help everyone determine if a fossil is a mold or a cast. I am interested in making the definitions and rules better, clearer and…[Read more]
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John Christian replied to the topic Mold, Cast and Steinkern in the forum What Is It? 8 years ago
8 years ago8 years agoThanks Benjamin,
So to simplify, a cast is made only against a mold. Right? A mold is only made by direct contact with the original fossil. Correct? Therefor my steinkern is an internal mold since it formed against the original shell… right?
I am a little confused by your use of “positive” and “negative” in reference to impressions. Does “po…[Read more]
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John Christian started the topic Mold, Cast and Steinkern in the forum What Is It? 8 years ago
8 years ago8 years agoI consider steinkerns formed from sediment that entered a hollow natural object (such as a bivalve) to always be internal molds. Am I correct?
If a hollow natural object (bivalve) is not filled by sediment but is later filled by a precipitated mineral such as calcite then the calcite should be considered an internal cast when the original s…[Read more]
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John Christian started the topic Mold, Cast and Steinkern in the forum What Is It? 8 years ago
8 years ago8 years agoI consider steinkerns formed from sediment that entered a hollow natural object (such as a bivalve) to always be internal molds. Am I correct?
If a hollow natural object (bivalve) is not filled by sediment but is later filled by a precipitated mineral such as calcite then the calcite should be considered an internal cast when the original s…[Read more]
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Cathy Young and John Christian are now friends 8 years, 1 month ago
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Jack Kallmeyer and John Christian are now friends 8 years, 1 month ago
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John Christian replied to the topic Case Miller's Original Post in the forum Fossil Prep Tips & Tricks Forum 8 years, 1 month ago
8 years, 1 month ago8 years, 1 month agoJack,
Here’s an article which mentions the use of a 75% solution. There are also references to other articles that mention the use of Rewoquat. http://palaeo-electronica.org/content/2013/530-microfossil-extraction
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Eleanor Gardner and John Christian are now friends 8 years, 1 month ago
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John Christian started the topic Texas Fossils in the forum Ideas for New Forums 8 years, 2 months ago
8 years, 2 months ago8 years, 2 months agoLet’s start a forum relating to Texas fossils and events. My friends at the Dallas Paleontology Society taught me a lot about the local fossils which I can share.
I just bought a book with great and detailed colored photos to help with identifying Texas and U. S. Pennsylvanian fossils. All fossil guides should be this detailed and i…[Read more]
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John Christian started the topic Texas Fossils in the forum Ideas for New Forums 8 years, 2 months ago
8 years, 2 months ago8 years, 2 months agoLet’s start a forum for Texas fossils and events. My friends at the Dallas Paleontology Society taught me a lot about the local fossils which I can share.
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John Christian started the topic modern vs pre-Columbian horse teeth in the forum The Fossil Horses Forum 8 years, 2 months ago
8 years, 2 months ago8 years, 2 months agoI found some probable horse teeth in a creek near Dallas, TX. Can you tell morphologically if these are modern or pre-Columbian teeth? If late pre-Columbian teeth look like modern horse teeth are there other easy ways to tell their age- color, hardness etc. to differentiate the two?
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John Christian replied to the topic printable photo scale bars in the forum Help Forum 8 years, 2 months ago
8 years, 2 months ago8 years, 2 months agoYou can also order photo scales with the geological time divisions on the back from the Geological Society of America.
https://rock.geosociety.org/Store/detail.aspx?id=PTS001
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Thanks, @john-christian. One more question–is the Finis Shale part of the lithostratigraphy? For example, would I put Finis Shale in Member or Group? Or somewhere else?
The Finis Shale is the member.