Most deep-sea trenches in the Pacific are floored by normal basaltic oceanic crust overlain by pelagic sediments and ash. |
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The Moine rocks are overlain unconformably by post-Caledonian, Old Red Sandstone sedimentary rocks. |
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These mid-Palaeozoic formations are unconformably overlain by the Carboniferous-Permian Pillahuinco Group. |
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The uppermost Guweyza, overlain by the Sid'r Formation, has yielded Oxfordian radiolarians in a more distal section. |
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These are overlain by low-grade metamorphosed sediments and volcanics of Ordovician and Silurian age. |
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The exposed serpentinite dome was surrounded and partly overlain by crustal blocks. |
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In contrast, in the section south of the turbidites the lavas dip steeply northwards, and basalts are overlain by andesites. |
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Basalt is commonly overlain by a sandstone-grit unit that locally grades upward into shale. |
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Here, the upper mudstone of the TST is erosively overlain by 3 m of bioturbated, clayey sandstone and mudstone. |
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Dark, lichen-covered rocks towered above us in near-vertical cliff faces, some overlain by frozen waterfalls. |
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The unconformity surface is overlain by sandstone, reworked chalk or tuff, and represents submarine or subaerial erosion and missing section. |
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The basal, coarse layer of a varve is commonly overlain by microlaminared silt and clay, reflecting variable streamflow during summer. |
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In Tertiary time, the Batain nappes were unconformably overlain by carbonate and elastic rocks. |
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The dorsal ligament groove is overlain dorsally and flanked laterally by the nacreous middle shell layer. |
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That unconformity is overlain by sandstones of the Puentelles Formation, dated as late Kasimovian based on its fossil flora. |
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Little has been published about the stratigraphic age of this group, which is abruptly overlain by these limestones. |
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The shallow soils are derived from fluvial gravel overlain by multiple ash deposits and aeolian dust. |
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These units are conformably overlain by fluvial and lacustrine volcaniclastic deposits, tuffs and hyaloclastites. |
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Volcanoes of the western Hungarian volcanic field also consistently comprise basal glassy pyroclastic units overlain by lavas that cap buttes. |
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The shallow soils are derived from fluvial gravel overlain by multiple Holocene volcanic ash deposits and aeolian dust. |
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Basal erosion surfaces are locally overlain by a grey pebble-sized lag of mud chip and pedogenic carbonate clasts. |
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The upper unit consists of red continental clastic rocks of presumed Pcrmo-Triassic age, overlain by Triassic carbonate rocks. |
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These are unconformably overlain by Lower Carboniferous limestones of the Alapaevsk unit and cut by a Permian granite. |
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There are several examples of ancient families or subfamilies being splintered and partially overlain by other groups expanding into the older language's territory. |
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It is overlain by the lower shale member, which consists of interbedded carbonaceous shale and lignite that accumulated in coastal marsh and swamps landward of the shoreline. |
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In most areas the original flat, bituminised felt covered roof had been overlain with a profiled metal decking set as a pitched roof with slopes falling from a central apex. |
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Basement rocks consist of Tortonian volcanic rocks unconformably overlain by Messinian marine marls, coral-reef limestones and carbonate breccias. |
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Each of these units shows an amalgamated upper-shoreface sandstone section over 20 m thick, sharply overlain by transgressive sheltal shales about 50 m thick. |
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The upper contacts are mostly sharp and overlain by interbedded mudstone, dark brown mudstone, laminated mudstone and occasionally fine-grained sandstone. |
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Permian shelf-type successions there pass into Triassic sandstones and shales with detached Permian limestone blocks, overlain by Upper Triassic neritic carbonates. |
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In contrast, the Le Sauvage fields remain closely associated with prehistoric cairns, and some are overlain by Rivalte-type walls, so are at least pre-Medieval. |
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An empirical permineralization model was developed for the setting of a normal peat deposit overlain by a thick terrestrial shale deposited by a nearby river. |
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The sequence comprises Lower Ordovician conglomerates and carbonates overlain by Upper Ordovician to Middle Devonian limestone with occasional phyllite and quartzite. |
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These beds are overlain conformably by the Los Molles Formation. |
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Lothagam is a more restricted area and its strata are older-late Miocene to early Pliocene, overlain unconformably by Quaternary sands, gravels, and coquinas. |
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The clay sediments are locally overlain by peat deposits forming raised mires. |
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The southern edge of the dome is overlain by sandstones of Triassic age though they barely impinge on the National Park. |
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The southern edge of the dome is overlain by sandstones of Triassic age though these barely impinge upon the National Park. |
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In the area to the north of Sticks Pass the Birker Fell andesites are overlain by the Lincomb Tarns Tuff Formation. |
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Each of these structures consists of Carboniferous limestone overlain with Millstone Grit. |
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At the summit this is overlain by scree and to the south are areas where the underlying Loweswater Formation surfaces. |
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This formation is overlain by light to dark dolomite containing coral, sand and crinoids, having less than 100 m thickness. |
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The till is overlain by glaciolacustrine sands, silts or varved clays, up to 25 m in thickness. |
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This appears to be a constructed surface, overlain by further coprolite deposits. |
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Archean metavolcanic and metasedimentary rocks are unconformably overlain by Proterozoic rocks of the Huronian Supergroup. |
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Lower Cretaceous deposits are transgressively overlain by those of the Upper Jurassic. |
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The Wealden Group is overlain by the Lower Greensand and the Gault Formation, consisting of the Gault and the Upper Greensand. |
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It is unconformably overlain by gravel-rich slope-wash deposits. |
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Gold at Nome was concentrated in three ancient beach lines, now inshore, above sea level, and buried under roughly fifty feet of permafrost overlain by two feet of tundra. |
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Devonian conglomerates composed of sandstones and pelites appear in the area, and Carboniferous marine formations are unconformably overlain in sequence. |
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West and east of Doncaster the coal measures are overlain by younger rocks, permian limestone, where the area is referred to as the concealed coal field. |
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Puerto Rico is composed of Cretaceous to Eocene volcanic and plutonic rocks, overlain by younger Oligocene and more recent carbonates and other sedimentary rocks. |
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The lowermost Devonian formation is the St Maughans Formation, itself overlain by the Brownstones Formation though with an intervening Senni Formation over much of the area. |
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The Lower Old Red Sandstone is unconformably overlain by Upper Old Red Sandstone, where the Upper Old Red Sandstone is tilted close to the Highland Boundary Fault. |
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The next layer is massive, reddish-grey silt with diffused organics, overlain by an interval of varicoloured, deformed and stratified silt and medium sand. |
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Relationships between open-water intervals and floodplain deposits cannot be determined where open-water units are erosionally overlain by multistorey sandstones. |
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Orthoimagery that included natural-color and color-infrared, along with DEM derived slope and hypsography could be overlain onto the terrain model at will. |
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These rocks are overlain by till over the rest of the summit area. |
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The Dalradian metasedimentary rocks are overlain by an obducted ophiolite that is continuous for at least several kilometers on either side of the Highland Boundary Fault. |
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Much of the summit is overlain with peat and there is a fault to the south west, beyond which are greywacke sandstone turbidities of the Loweswater Formation. |
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