Distinguishing features:
Parent taxon (Sollasites): Elliptical with relatively wide central-area spanned by complex structure
This taxon: Narrowly elliptical; central area with longitudinal bar and ca. 20 lateral bars; small (4-5µm)
Farinacci & Howe catalog pages:
P. arctus *
| LITHS: placolith, elliptical, CA: ca_disjunct, grill, CROSS-POLARS: V-prominent, |
| Lith size: 4->5µm; Data source notes: Bown (1987) |
Geological Range:
Last occurrence (top): within Early Toarcian Substage (177.50-184.20Ma, top in Toarcian stage). Data source: Bown & Cooper 1998
First occurrence (base): within Early Toarcian Substage (177.50-184.20Ma, base in Toarcian stage). Data source: Bown & Cooper 1998
Plot of occurrence data:
Bown, P. R. & Cooper, M. K. E. (1998). Jurassic. In, Bown, P. R. (ed.) Calcareous Nannofossil Biostratigraphy. British Micropalaeontological Society Publication Series . 34-85. gs O Bown, P. R. & Young, J. R. (1997). Mesozoic calcareous nannoplankton classification. Journal of Nannoplankton Research. 19(1): 21-36. gs Bown, P. R. (1987a). Taxonomy, evolution, and biostratigraphy of Late Triassic-Early Jurassic calcareous nannofossils. Special Papers in Palaeontology. 38: 1-118. gs Goy, G., Noël, D. & Busson, G. (1979). Les conditions de sédimentation des schistes-carton (Toarcien inf.) du bassin de Paris déduites de l'étude des nannofossiles calcaires et des diagraphies. Document des Laboratoires de Géologie de la Faculté des Sciences de Lyon. 75: 33-57. gs O Noël, D. (1973). Nannofossiles calcaires de sédiments jurassiques finement laminés. Bulletin du Muséum National d'Histoire Naturelle, Paris. 75 [1972]: 95-156. gs References:

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Sollasites arctus compiled by Jeremy R. Young, Paul R. Bown, Jacqueline A. Lees viewed: 18-1-2026
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