The company draws upon four main basins in Argentina, including the big Cerro Dragon block in the southern part of the country.
Open image in new window Fig. 2 Karoo Supergroup stratigraphy and its subdivisions in main basin of South Africa.
The main basin is generally stratified in the summer, because of river discharge and solar heating, and is often well mixed in the winter [49].
Drowned river mouth lakes (i.e. lakes formed at the outlets of rivers into the main basin) are also common in Lake Michigan, contain yellow perch subpopulations, and may act as additional sources of genetic material distinct from the main lake body (Parker et al. 2009).
The other sites, located in the center of the gulf (NG2, 3), were sampled bimonthly, whereas the station in the Rusinga Channel (NG4) and in the main basin of Lake Victoria (KO5) were sampled quarterly.
A broad isotopic enrichment of ∼16% through a 9-m-thick sedimentary sequence in the main basin is interpreted to indicate a shift from C3 to C4 plant dominance.
In the main basin of Lake Victoria, during the dry period (June to September and December to February), the water column increases in stability causing a reduced daily vertical mixing (Hecky, 1993).
A few aquatic animals live in the lake's main basin, including centimeter-long brine shrimp (Artemia franciscana).
The main basin draining the lake is a complex of five interconnected basins with causeways; the Nehru Park basin, the Nishat basin, the Hazratbal basin, the Nagin basin and the Barari Nambad basin.
Within the main basin, Elliott, Commencement, and Port Gardner Bays, associated with Seattle, Tacoma, and Everett, respectively, have depths in excess of 100 m.
