Underwater dissolutional pitting on dolostones, Lake Huron-Georgian Bay, Ontario
This paper examines underwater dissolutional pitting along the dolomitic shorelines of the Bruce Peninsula around Tobermory, Ontario. It describes the morphology and spatial distribution of pits beneath the modern lake level, and develops
a morphological classification of the pit types. A model to explain pit genesis including initiation and enlargement incorporating this post glacial lake level history is proposed.
Borrow pits are the large holes made when fill was required to build up roadbeds and ramps during the construction of the U.S. Interstate highway system. In the process, a new roadside settlement feature has been created. - (DWG)
Weathering pit characteristics and topography on Stone Mountain, Georgia
A detailed analysis of weathering-pit distribution on Georgia's Stone Mountain granite dome reveals a complex relationships between pit size and density, compared with slope aspect and angle. The AA. conclude that insolation weathering may be a more
important process in granite pit formation on Stone Mountain than commonly believed because afternoon temperature maxima accelerate weathering through increased chemical constituent dissolution and/or crystal constituent disintegration.
Pit avulsions and planform change on a mined river floodplain : Tangipahoa River, Louisiana
Using geospatial data from the mined Tangipahoa River floodplain for 1980 to 2004, the aims of this study are to (1) assess if pit characteristics such as proximity to channel and size affect the potential for diversion; and (2) interpret
relationships between pit diversions, channel changes, and floods. Of the 56 pits mapped in the floodplain in 1980, 6 had been captured by 2004. Captured pits were closer to the main channel than those which were not captured, but the areas of captured
and noncaptured pits were not significantly different. However, avulsions into large pits caused more channel planform change than those into smaller pits. These results will be useful in understanding landscape vulnerability and can be applied to river management
Numerical ages of Holocene tributary debris fans inferred from dissolution pitting on carbonate boulders in the Grand Canyon of Arizona
In this paper, ages of debris-fan are estimated from linear relation between surface age and the average depth of dissolution pits on carbonate boulders, beside the Colorado River in Grand Canyon National Park. Dissolution pits result from
a combination of weakly acidic rainfall and the metabolic activity of blue-green algae. The average depth of dissolution pits increases with relative age of fan surfaces. If not the result of differential preservation of fan surfaces, the clustering implies
Aeolian activity at a giant sandstone weathering pit in arid south-central Utah
Aeolian abrasional, depositional and deflational features indicate exceptionally strong southwesterly winds in a giant sandstone weathering pit in Grand Staircase Escalante Monument. This pit has developed near the summit of a broad, barren high
dome on the Lower Jurassic Navajo Sandstone. The field work involved describing the morphology and morphometry of the pit and groove, including a large variety of streamlined abrasional features. The combination of lags, groove marks, flutes, dedos
and linear, sharp-crested ridges, and shifting dune sand within the pit are evidence of the aeolian activity. These dedos and other streamlined aeolian sculpted host-rock features occur in clusters and typically form in the lee of iron concretions. The dedos
are similar to the controversial stalked blueberries on Mars. A bedrock valley descends to the southwest from the pit and groove, amplifying southwesterly winds.
An examination of 189 well-delineated mounds and pits in sandy soils of northern lower Michigan, all presumably formed by tree uprooting, was used to determine the effects of slope angle on morphology and volume, and to assess the potential
importance of uprooting to mass movement. Data indicate that mound and pit volumes increase with increasing slope angle, suggesting that on gentle slopes more of the disturbed soil wastes off the mound, back into the new pit.
1) BENEFICIAL AND ADVERSE EFFECTS OF EXCAVATION OF AN INCREASING NUMBER OF GRAVEL PITS IN ALLUVIAL FORMATION TO SUPPLY BUILDING MATERIAL AND BACKFILL. 2) HYDRODYNAMIC EFFECT OF THE FREE WATER IN THE PITS. INVESTIGATIONS REQUIRED PRIOR TO PROJECT
APPROVAL. FACTORS TO ALLOW FOR AND IN-SITU MEASUREMENT REQUIREMENTS. 3) TWO RECENT CONCRETE EXAMPLES. DETERMINATION OF A PRACTICAL METHODOLOGY FOR SIMULTANEOUS WORKING OF GROUNDWATER SUPPLIES AND GRAVEL PITS.
Coal ; Czech Republic ; Flood ; Land improvement ; Mining activity ; Mountain ; Pit ; Pond ; Water ; Water management
The reclamation and revitalisation in the brown-coal field area in the Ore Mountains area has three basic modes (agricultural, forest, hydro). The most convenient alternative is the decision to flood residual pit mines. The example
of the Chabarovice pit mine shows that the utilisation of new ponds can be multifunctional. - (MS)
Weathering pits as indicators of the relative age of granite surfaces in the Cairngorm Mountains, Scotland
This paper explores how weathering pit depth can be combined with cosmogenic exposure ages to elucidate age relationships across a complex rock landscape. The study area lies in the Cairngorms Mountains, Scotland. Well-developed weathering pits
On the genesis of granite pits on top of the Shigujian Peak of the Dayangshan Mountain in Jinyun County, Zhejiang Province
The identification results through micropolariscope and X-ray fluorescence spectrometer reveal that bedrock of pits is from middle to fine-grained moyite being apt to be weathered and modified. Based on field investigation and periglacial geomorphic
theory, the pits on top of Shigujian Peak are attributed to freezing-thawing of periglacial action. Meanwhile, storm and strong wind accelerate the process. Observation shows that both the actions are still undergoing and variant directions of wind
are the main cause for making different shapes of the pits. Because the top of Shigujian is 1500 m lower than the present snow line, some scholars considered that glacial pothole formed in the Quaternary is hard to work, even though in the Last Glacial Maximum
and European colonial gravestones, ancient Hindu temples, Jain rock cut temples and bas reliefs, prehistoric iron and bronze age megaliths, and natural outcrops. Ancient charnockite megaliths have weathering pits and the old inselberg surfaces have large tafoni
. The AA. believe that at the same time as the pits are enlarging, the surfaces are exfoliating, that removes the smaller pits. But the small pits do not reform on the old surfaces. This strongly suggests that something is preventing the development of new
pits that might be used to conserve ancient stone monuments.
In October 1965 and February 1966, 55 Young-pits were installed in tropical Northern Territory (NT) and temperate New South Wales (NSW). Pits were monitored in 1968, 1971 and 1974; also for the NT only, in 1988. In each region, half of the pits
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
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.
Near Westcliffe, Colorado, data were collected from a transect on the east slope of the Sangre de Cristo Mountains. Ages of pit/mound complexes with rock fragments exposed at the surface by root throw ranged from recent (freshly toppled tree
) to unknown (complete tree decay). Calculations based on dimensions of the pit/mound complexes, estimated time of tree topling, sizes of exposed rock fragments, and percentage rock covers at pit/mound complexes, as well as within the transect area, indicate