“Sphaerocodium,” a misinterpreted Fossil from the Wenlock limestone
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[1] Jesse Harlan Johnson. Nubecularia from the Pennsylvanian and Permian of Kansas , 1947 .
[2] A. Wood. “Algal Dust” and the Finer-grained Varieties of Carboniferous Limestone , 1941, Geological Magazine.
[3] A. Wood. The lower carboniferous calcareous algae Mitcheldeania Wethered and Garwoodia, gen. Nov. , 1941 .
[4] E. J. Garwood,et al. On the Geology of the Old Radnor District, with special reference to an Algal Development in the Woolhope Limestone , 1918, Quarterly Journal of the Geological Society of London.
[5] A. Rothpletz. Über die Kalkalgen, Spongiostromen und einige andere Fossilien aus dem Obersilur Gottlands , 1914 .