As these plumes often reach up into the productive photic zone
, they discharge large quantities of material into the surface water layers.
Secchi disk readings were performed to define thickness of the photic zone
and the sampling depth according the percentage of surface irradiance (Io).
Following the movements of Johnny, Oscar, and Roland, Braun has found that sharks can dive thousands of feet daily through the oceans photic zone
, where light gets through, to the colder, deeper, darker mesopelagic zone.
The Photic Zone
Llc., The Photic Zone
Llc, 1489 Roma Rd.
The larger benthic foraminifers were the most common constituents of the late Palaeocene to Early Eocene carbonate platforms (Hottinger, 1998) and they were of tropic in nature, lived within shallow photic zone
in symbiosis with algae (Scheibner et al., 2005).
To begin with the history of diagenesis the first would be micritization of carbonate grains a slow process generally takes place in a low energy restricted environments or shallow environment within photic zone
(Tucker and Wright 1990).
Based on regional topography and the rich benthic and pelagic faunal association comprising brachiopods, trilobites, tentaculitoids, scolecodont-bearing polychaetes, graptolites, chitinozoans and abundant sclerobionts, it is interpreted as having been deposited in a low-energy proximal shelf environment below the photic zone
(Calner et al., 2000; Jarochowska et al.
huxleyi was dominant amongst the about 30 coccolithophore species present; a few more coccolithophore species were found offshore because the assemblage included deep photic zone
taxa such as Florisphaera profunda and Gladiolithus flabellatus, which were not found in the shallow waters of Levante Bay.
The presence of these large and flat forms (lepidocyclinidae and nummulitidae) in the lower part of Asmari Formation, in comparison with analogues in the modern platform allowed interpreting these sediments as having been deposited in the lower photic zone
Both the upper and the lower covers have 50 mm diameter circular photic zone
; the rest part is made as matte at roughness 3.2 and fastened via eight through-bolts in uniform distribution.