Palaeosiphonella cloudii Licari

Plant Fossil Names Registry Number: PFN000275


Author: G. R. Licari

Rank: species

Reference: Licari, G. R. (1978): Biogeology of the late pre-Phanerozoic Beck Spring Dolomite of eastern California. – Journal of Paleontology 52(4): 767–792.

Page of description: 788

Illustrations or figures: pl. 3, figs 10, 11

Name is type for


Holotype n/n, Biogeology Clean Laboratory, University of California, Santa Barbara, California, USA
Figures: pl. 3, fig. 11

Note: Licari (1978): Holotype is the multi branching trichome on thin section C682(1) from the Cloud Collection. Coordinates (40.0, 7.3).

Original diagnosis/description

As for genus, presumed primary filaments range from 30 μm to 50 μm diameter (mean 38 μm for 43 filaments measured); lateral and presumed lateral branches average 13 μm (median 22 μm for 25 filaments measured). Observed thickness of walls 1-2 μm. Surface texture smooth to granular. See Table 2 for salient morphologic data


Named for Preston Cloud, Professor of Biogeology at the University of California, Santa Barbara, in recognition of his many contributions to the study of pre-Phanerozoic geology and paleontology.


Proterozoic, Mesoproterozoic
The fossiliferous outcrops occur 2,900 m below the lowest metazoan trace fossils, are younger than 1.7 b.y. and are correlated to the Apache Group of Arizona, bracketed between radiometric ages of 1.2 and 1.4 b.y.


United States
Locality 3 of 8/11/68 – Black laminated chert from partially silicified stromatolites within the top one meter of exposed outcrop of the Beck Spring Dolomite on the north slope of the Kingston Range, south side of road 0.5 km east-southeast of Horse Thief Springs, north-eastern San Bernardino County, California. Unsurveyed NE¼ sec. 2, T19N, R10E, of Horse Thief Springs Quadrangle, California-Nevada (1:62,500). Elevation about 1,344 m.

Plant fossil remain

algae - other


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