However the region had been undergoing a series of marine transgressions ( called Dunkirk 0 through Dunkirk IIIb ) characterised by a rising water table and floods that left layers of clay on the land.
32.
Distributions in Africa and the Americas, for example, from " Gyrocarpus hababensis " and " G . americanus ", relict character, appear to be due to marine transgressions in the past.
33.
It is thought to have been formed in two major episodes, the older dunes being partly drowned during an early Holocene marine transgression ( 9500-6000 C-14 years BP ) with the later generation of dunes forming within the last 900 C-14 years BP.
34.
Sea level rise during the marine transgression flooded the basin, forming a marine embayment from 11, 800 to 8, 700 and the basin rim was completely flooded by about 8, 000 years BP, at which point Bass Strait was formed and Tasmania became a separate island.
35.
Because marine transgressions cover distances, over time, the coeval units are separated by distance, and type of deposition material; the local subsidence, or uplift, as well as glaciation, and sea level changes, can cause variations in the deposition sequences of transgression-regressions.
36.
Though situated at the time near the equator ( where high temperatures and arid conditions facilitated evaporation ), the sea's inception likely stemmed from a marine transgression rooted in a phase of de-glaciation; the southern portion of Pangaea, the former ( and future ) Gondwanaland, supported ice sheets in the early Permian.
37.
The Upper Tal can be subdivided into lower quartzitic sequence and upper thick calcareous sequence containing abundant fragmentary shells of gastropods, bryozoa, etc . The Phulchatti quartzite succession represents the deposits of a shoal environment, while the uppermost shell limestone sequence indicates an increasing energy of the shallow tidal sea, and a marine transgression in the Cretaceous.
38.
The Lagoon was formed about six to seven thousand years ago, when the marine transgression following the Ice Age flooded the upper Adriatic coastal plain . . | group = lower-alpha } } Deposition of river sediments compensated for the sinking coastal plain, and coastwise drift from the mouth of the Po tended to close tidal inlets with sand bars.
39.
The Tapeats unit is the bottom member of the Tonto Group, a typical " marine transgression series " of sandstone-( conglomerate )-shale-limestone, all part of a paleo sea, initially adjacent to land, the source of the Tapeats rocks-( conglomerates ) and sand; ( a regressing sequence has the reverse order ).
40.
"It is more likely that the Peri-Adriatic Platforms worked with temporary continental bridges that connected with Laurasia Gondwana in central Tethis, allowing migration between the two hemispheres and colonization of local coastal habitats . " " During the marine transgressions, some of these lands were isolated, implicating genetic Mutations in their terrestrial faunas, with typical biological consequences, as endemism and possible dwarfism ".
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