Triassic palynology of the WarangSandstone (Northern Galilee Basin) and its phytogeographic implications in Gondwana Five. Selected papers and abstracts of papers.
In this paper, three types of Liesegang blocks from sandstone beds of the Hojedk Formation are described. The factors involved in their formation, and their tectonic implication are discussed.
Weathering rates of Tertiary sandstone and mudstone in Japan
Cenozoic ; Erosion rate ; Honshu ; Japan ; Marine terrace ; Sandstone ; Sedimentary rock ; Tokyo ; Weathering
, Japan. The bedrock of terraces consists mainly of Tertiary sandstone and mudstone. The mode of deceleration in the weathering rates with time differs between mudstone and sandstone. Initially mudstone weathers faster than sandstone, but the mudstone
weathering rate decreases more rapidly than sandstone, and after about 400 years, the sandstone rate exceeds that of mudstone.
Conical sandstone landforms cored with clastic pipes in Glen Canyon National Recreation Area, southeastern Utah
Arid area ; Differential erosion ; Sandstone ; United States of America ; Utah ; Weathering ; Wind erosion
Clusters of conical sandstone landforms, many with summit weathering pits, have developed on barren outcrops of the Jurassic Entrada Sandstone in Glen Canyon National Recreation Area. The conical landforms have developed on cylindrical bodies
of fluidized sandstone (clastic pipes) that typically have near-vertical contacts with the enclosing cross-bedded, eolian sandstone. These landforms vary in size and shape due chiefly to differential erosion of the clastic pipe relative to the enclosing
sandstone. The resistant rims of these pits are due in part to calcite-enriched pipe contacts. Sandy pit-floor sediment is removed principally by strong wind rotors and vortices.
Arid area ; Insolation ; Jordan ; Lithology ; Sandstone ; Statistics ; Threshold ; Weathering
The primary focus of this investigation was to examine the various mechanisms and rates responsible for sandstone weathering in an arid climate by controlling lithology, time, and the initial surface condition. However, the possible existence
Experimental weathering of sandstone by combinations of salts
Chemical erosion ; Experimentation ; Geochemistry ; Salt ; Sandstone ; Weathering
Laboratory experiments are described that examined the effectiveness of certain naturally occurring combinations of salts as weathering agents. Cubes of a highly quartzose sandstone were repeatedly soaked in one of a series of salt solutions
Mechanism and rate of weathering of Clarens sandstone by an endolithic lichen
An endolithic lichen was discovered actively eroding sandstone at a rate of 9.6 mm/100 years - three times faster than had previously been accurately measured.
Skalni hriby v pislovcich Broumovské vrchoviny. (Mushroom rocks in sandstones of the Broumovska vrchovina (Highland))
Regional distribution and the morphogenesis of mushroom rocks in the Upper cretaceous block sandstones of the Broumovska vrchovina Highland (NE Bohemia). (MS).
Sandstone response to salt weathering following simulated fire damage : a comparison of the effects of furnace heating and fire
Chemical erosion ; Derbyshire ; England ; Fire ; Geotechnics ; Salt ; Sandstone ; Simulation ; United Kingdom ; Weathering
To explore the differences between heating sandstone in a furnace and a real fire, sample blocks of Peakmoor Sandstone, quarried from Matlock in Derbyshire, were subjected to different stress histories in combination (lime rendering and removal
Temporal changes in colour, mineralogical, chemical, physical and mechanical properties due to weathering during 350,000 years were examined using sandstone gravel in fluvial terrace deposits with a known emergence time which were distributed
in the Miyazaki Plain, South Kyushu. The results suggest that leaching of matrix and increasing pore volume plays a major role in the weathering of sandstone.
Gypsum formation in non-calcareous building sandstone : a case study of Scrabo sandstone
Atmospheric pollution ; Belfast ; Building materials ; Chemical erosion ; Mineralogy ; Northern Ireland ; Sandstone ; United Kingdom ; Weathering
This paper addresses one central issue of building stone research : an origin for calcium in gypsum formation in non-calcareous sandstones. A comparative study of Scrabo sandstone from outcrops and a 120-year-old building in central Belfast shows
Die ontstaan van grotte en holtes in die kranse van die Clarenssandsteenformasie in die Golden Gategebied. (The origin of the caves and hollows in cliffs of the Clarens sandstone formation in the Golden Gate area.)
The origin of the caves and hollows could be ascribed to the following mechanisms: exudation, undermining of the sandstone by faster weathering of the sandstone below, faster weathering of shale or clay-bearing sandstone layers in the sandstone
and the solution of lime concretions in the sandstone. Exudation is probably the most important factor. An analysis of a sample of salt collected in a cave showed that the active exudation agents are sodium carbonate and sodium sulphate. With the exception
Ferruginous sandstone for building-stone in and round the Hageland
Belgium ; Building materials ; Inventory ; Natural resources ; Quarry ; Rock ; Sandstone
Ferruginous sandstone has locally been used extensively in mostly late-medieval religious and civilian architecture. An inventory of recognizable exploitation sites is presented. Genesis and related characteristics of the different types of building
Composition and genesis of the ferruginous sandstones of the Diest and the Poederlee Formations (Belgium)
Mineralogical and chemical study has shown that the genesis of the sandstones cannot be explained by a weathering in situ of Fe-bearing minerals or by other pedogenetic processes. The strong relative increase of Fe against Al, compared to the values
The Namib Sandstone is a consolidated rock deposit with considerable surface extent. It underlies and extends beyond the present Namib dune field. It provides a source for the Namib sands and is of importance in any analysis of the Namib's
Sandstones and conglomerates formed by precipitation of CaCO3 under stagnant ice sheet
Conglomerate ; Inland ice ; Lithology ; Lower valley ; Poland ; Quaternary ; Rock ; Sandstone ; Sedimentary ; Sedimentary rock ; Wisła
Quaternary sandstones and conglomerates found on the valley-sides of the lower Vistula River have been identified as a product of precipitation of CaCO3 under stagnant Middle-Vistulian ice sheet. The trigger mechanizm of precipitation of CaCO3 has
A note on sand ripples developing in sandstone rock seepages of the Weald, UK
Algae ; Biogenic process ; England ; Kent ; Ripple-mark ; Sand ; Sandstone ; Sedimentary ; Travertine ; United Kingdom ; Weathering
Ephemeral sand ripples are described from steep sandstone rock surfaces in the south of England. They are unconsolidated or stabilized by algae and bryophytes. The sand is transported by flowing water to produce a semi-regular pattern of sinuous