This unique, biogenetically produced topography sets the stage for colonization by shallow-tier burrowers, particularly the upogebiid shrimp Upogebia vasquezi and several species of fiddler crabs.
The delayed development of intensive sediment mixing may have also mediated exceptional preservation of both fossilized soft tissues and shallow-tier trace fossils, and may therefore have contributed to the anomalous preponderance of Konservat Lagerstätten and exceptionally preserved shallow-tier trace fossils and bioglyphs characteristic of the lower Paleozoic stratigraphic record.
All the theaters were built on the same basic model of tier upon shallow U-shaped tier of seating, rising over a bare wooden-floored orchestra section.
A spontaneous chorus of young people, two dozen or so strong, had arranged itself on a tier of shallow steps and was loudly singing "La Vie en Rose".
These long racks, which are simply tiers of shallow ledges about four-CD's-deep, are probably ideal for browsers who like to mosey along, flipping through CD's, picking up and discarding them at random.
Contaminants may have entered yards and homes through air transport and deposition, surface water runoff, and shallow ground-water transport during this period, especially in tier 1 (NYSDOH 1981).
Two-tier aquifer systems exist for the newer alluvium areas, the shallow one is AQ-I and deeper one is AQ-II, vertically separated by a clay bed of varying thickness.
A two-tier aquifer system exists in the Newer alluvium area, and the shallow aquifer, formed by the paleo channel of Sone River, forms a potential aquifer.
Hexactinellids are relatively rare and limited in the lower tiers in the shallow-water community, but dominate in the deep-water communities.
