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Can this Silurian trilobite from Burnet County, Texas, be identified?


Oxytropidoceras

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Attached are pictures of trilobites I recovered in my early years, late 60s, from strata indentified as the Starcke Limestone by Miller (1972). At this outcrop, Silurian Starcke Limestone fills paleokarst depression developed in older Ordovician carbonates in Burnet County, Texas. 

 

The plastic cubes are one centimeter square.

 

(Yes, I know that Starcke is mispelled on the label. Too late to change it now, 56+ years after the fact.)

 

References cited:

 

Miller, R.H., 1972. Silurian conodonts from the Llano region, Texas. Journal of Paleontology, pp. 556-564.

 

 

StarckeLimestone001.jpg

StarckeLimestone002.jpg

Edited by Oxytropidoceras
added information about square cubes
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This Starcke Limestone pygidium is a good match with Lygdozoon sp.

 

According to Holloway 1977 & 1981: similar to Lygdozoon arkansanum from the St. Clair Limestone of Arkansas.

 

image.png.4e7db2822ec6a348c02a929c0dbfb474.png

 

Holloway, D.J. 1978
Silurian Trilobites from the St. Clair Limestone (Arkansas) and Clarita Formation (Oklahoma).
PhD Thesis: University of Edinburgh, 427 pp.

 

Holloway, D.J. 1981
Silurian Dalmanitacean Trilobites from North America and the Origins of the Dalmanitinae and Synphoriinae.

Palaeontology, 24(4):695-731  PDF LINK

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image.png.a84de26dad44fb03836a743755df237c.png

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The taxonomy has been revised since Holloway 1981. Lygdozoon is classified now as a junior synonym of: Delops

 

"These [features] demonstrate that there is no justification for retaining separate genera,

and Delops is therefore considered to be a senior subjective synonym of Lygdozoon."

 

Storey, A.J., Thomas, A.T., Owens, R.M. 2016

The Deep-Water Trilobite Association of the Silurian Coldwell

Siltstone Formation of Northern England and its Wider Significance.

Proceedings of the Yorkshire Geological Society, 61(1):1-23  PDF LINK

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image.png.a84de26dad44fb03836a743755df237c.png

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