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Posts treating: "Belen Formation"

Thursday, 04 September 2014

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Pleurodictyum amazonicum coral from Bolivia 

Views of the Mahantango [2014-09-04 09:01:00]  recommend  recommend this post  (192 visits) info

 Devonian; BO,US
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Pleurodictyum is a favorite coral of mine and now I have specimens from the Devonian of Bolivia in my collection. Below are three examples of Pleurodictyum amazonicum corals from the Belen formation. All three are casts of the original fossils found in nodules. The original calcium carbonate skeletons have long since dissolved away and only the mud filled voids are preserved. Despite this the fossils are still identifiable due to the somewhat unique growth pattern of the genus.Specimen #1 [...]

Platyceras bistrami gastropod from Bolivia 

Views of the Mahantango [2014-09-02 09:01:00]  recommend  recommend this post  (140 visits) info

 Devonian; BO
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This is a gastropod fossil called Platyceras bistrami from the Belen formation (Devonian, Emsian stage) of Bolivia. It seems to be distinguished from other species by the undulating surface of it's shell. This is just a cast of the shell but the ripples are preserved well. Also, P. bistrami (when I write it that way it makes me think of Pastrami) has a tighter coil to it's shell than other species.This specimen was found south of La Paz, Bolivia and I purchased it off of

Metacryphaeus sp. trilobite from Bolivia 

Views of the Mahantango [2014-08-31 09:01:00]  recommend  recommend this post  (696 visits) info

 Devonian; BO
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I posted in an earlier blog entry about some Trilobite fossils I had from Bolivia. At the time I could not tell what the genera was of them because there were no labels. Well I found the specimen below in a box with some older E-bay purchases and it has a label calling it Metacryphaeus sp. (which makes my job that much eaiser!). It is preserved in a neat pose that looks like it was buried in the mud, with just it's head exposed, while it awaited prey.This specimens come from the Belen formation [...]

Conularia from Bolivia 

Views of the Mahantango [2014-08-29 09:01:00]  recommend  recommend this post  (146 visits) info

 Devonian
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These are some Conulariids from Bolivia that I received as part of "grab bags" of fossils I purchased on E-bay. Nothing was labelled but based on pictures from this seller on E-bay, I have tentatively assigned ID's. All come from the Belen formation (Devonian, Emsian stage) and were found in an area south of La Paz.Specimen #1 - Conularia brevis?Specimen #2 - Conularia quichua? this is a 3-D specimen.Specimen #3 - Paraconularia ulrichana (I found the label for these next two specimens)Specimen [...]

Eldredgeia/Metacryphaeus Trilobites from Bolivia 

Views of the Mahantango [2013-07-31 09:01:00]  recommend  recommend this post  (134 visits) info

 Devonian
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In the last few years there have been some interesting Devonian aged fossils coming out of Bolivia. I have mostly been purchasing mine from this seller on E-bay. They are found in small, round concretions so you often get a mold and cast of the fossil. Among the fossils I have acquired are some fairly nice trilobites with the most common specimens labelled Eldredgeia venustus; although some specimens could be another closely related genera, Metacryphaeus. The only way to tell them apart is to [...]

Unknown crinoid species #2 from Bolivia 

Views of the Mahantango [2013-03-12 08:01:00]  recommend  recommend this post  (669 visits) info

 Devonian
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In the last few years there have been some interesting Devonian aged fossils coming out of Bolivia. I have mostly been purchasing mine from this seller on E-bay. Among the fossils I have acquired are some unnamed crinoids.This is the third (and possibly fourth?) species that I have in my collection from Bolivia.This species has long arms covered in hair like pinnules that act like cilia to catch passing particles of food. Not much of the calyx has been preserved on this specimen so I don't have [...]

Unknown crinoid species #1 from Bolivia 

Views of the Mahantango [2013-03-10 09:01:00]  recommend  recommend this post  (120 visits) info

 Devonian
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In the last few years there have been some interesting Devonian aged fossils coming out of Bolivia. I have mostly been purchasing mine from this seller on E-bay. Among the fossils I have acquired are some unnamed crinoids.These specimens come from the Belen formation (Devonian, Eifelian stage) south of the capitol of Bolivia, La Paz. This is the second of (at least) three species that I have in my collection from Bolivia. Specimen 1The species is small with long, smooth arms that branch [...]

Ctenocrinus branisai crinoid from Bolivia 

Views of the Mahantango [2013-03-08 09:01:00]  recommend  recommend this post  (152 visits) info

 Devonian
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In the last few years there have been some interesting Devonian aged fossils coming out of Bolivia. I have mostly been purchasing mine from this seller on E-bay. Among the fossils I have acquired are some unnamed crinoids. Update: A paper was recently published in the Journal of Paleontology by Jeffrey R. Thompson, William I. Ausich and Legrand Smith titled "Echinoderms from the Lower Devonian (Emsian) of Bolivia (Malvinokaffric Realm)". Based on the descriptions and plates in the paper I [...]
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