April 2002
Do we really know Cretaceous non-Tethyan radiolarians from the Northern Hemisphere? These rads are from a clastic unit, the Kiselyovsky accretionary wedge terrane, Far Eastern Russia.
Age - Albian
Present-day latitude is 51 N, with no indication of any appreciable post-accretional displacement. No paleomagnetic data exist yet.
Together with other "strangers" these forms comprise about 90 % of residues.
I differentiated four species (see pictures below). With decreasing in height morphologies change from "slimmer" to "fatter" twice. The largest species is particularly asymmetric - bent about a pore in the middle of the test/chamber.
If anybody saw the similar morphologies, please let me know.
Scale bar = 100 microns |
