This may be of help regarding Ordovician although most of the detail
is on the shallow currents...
I only have a copy in manuscript form, but I think it appeared in the
Memorial University Ordovician Symposium Volume...?...I think...
Oceanography in the Ordovician
Wilde, P., Berry, W.B.N. & Quinby-Hunt, M.S.
Hope it helps
Robin
Mans desires are limited by his imagination
No-one can desire waht he cannot imagine.