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138 results for “Boulders”
Data from: Historical demography of four gecko species specializing in boulder cave habitat – its implications in the evolutionary dead end hypothesis and conservation
Specialization in narrow ecological niches might not only help species to survive in competitive or unique environments but also contribute to their extermination over evolutionary time. Although the "evolutionary dead end" hypothesis has long been debated, empirical evidence from species with detailed information on niche specialization and evolutionary history is still rare. Here we used a group of four closely related Cnemaspis gecko species that highly depend on granite boulder caves in the Mekong Delta to illuminate the potential impact of ecological specialization on their evolution and population dynamics. Isolated by the unsuitable habitat of a flood plain, these boulder-dwelling geckos are among the most narrowly distributed Squamata species in the world. We applied several coalescence-based approaches combined with the RAD-seq technique to estimate their divergence times, gene flow and demographic fluctuations during the speciation and population differentiation processes. Our results showed long-term population shrinkage in the four geckos and limited gene flow during their divergence. The results suggest that the erosion and fragmentation of the granite boulder hills have had great impacts on these populations' divergences and population declines. We argue that the specialist gecko's habitat specialization has facilitated the fine-scaled speciation in these granite rocky hills; in contrast, specialization might also have pushed these species toward the edge of extinction. Our study also emphasizes the conservation urgency of these vulnerable, cave-dependent geckos.
Mossy boulder
Medium size mossy boulder. Scanned in the Tatry - Slovakia. Taken with a smartphone. Suitable for natural scenes. Source: Objaverse 1.0 / Sketchfab
Howden Hill boulder
Nice big boulder proud above the ground with what seems like eight cup-marks, of different sizes, on its top surface. But is it (I hear you ask) a true example of prehistoric rock art? The depressions have clearly been subject to much erosion and weathering by rain, wind and frost, possibly over a great number of years. All traces of their human origins (such as peck marks) would of course have disappeared and there are no rings around any of the cups or other additions that would prove a human was involved in at least their initial formation. There are, however, good examples of prehistoric cup-marked boulders in the vicinity, arguably better preserved under turf. Bronze Age cairns are nearby. The alternative view of their formation is one of geology and weathering. Fluting and basins are often seen on exposed sandstone, particularly on upturned boulders and standing stones. What is the effect of weathering on known rock art: over-deepening and enlargement of existing hollows, or a smoothing of the surface? Source: Objaverse 1.0 / Sketchfab
East Lix, Killin - Cup Marked Boulder
A large boulder hidden in the forest above the old railway spur to Killin. ScRAP 1086 Source: Objaverse 1.0 / Sketchfab
Petroglyph Boulder and Rock Gongs
A boulder with a petroglyph of a long-horned bovine and two rock gongs from the Fourth Cataract of the Nile, Sudan. Now in The British Museum, London. Petroglyph: https://www.britishmuseum.org/research/collection_online/collection_object_details.aspx?objectId=3287928&partId=1 Rock Gongs: https://www.britishmuseum.org/research/collection_online/collection_object_details.aspx?objectId=3287901&partId=1 https://www.britishmuseum.org/research/collection_online/collection_object_details.aspx?objectId=3287932&partId=1 293 photos taken in May 2019 with a Sony a6000 and processed in Agisoft Metashape. Source: Objaverse 1.0 / Sketchfab
Petroglyph Boulder (4)
Museo de Antropologia de Xalapa, Mexico Piedra del Maiz, Huasteca. Source: Objaverse 1.0 / Sketchfab
Transition Edge Sensor Signals (Boulder)
<h1>Content</h1> <p>Transition Edge Sensor (TES) signals from an attenuated coherent source. The mean photon number of the source goes from 2.26 to 7 082 112 (29 dB to 7 dB of attenuation).</p> <p> </p>
Selected boulders at Copernicus central peak from L. Sun and P. Lucey Lunar boulder study work
<p>This file contains the location of 54 boulders and soils on Copernicus central peak that were studied by Sun L. and Lucey P. G. in their lunar boulder study paper. This file can be uploaded to the LROC Quickmap website (https://quickmap.lroc.asu.edu/) for checking the location of each boulder and their nearby soils.</p>
Non-exhaustive record of locations of Shap granite (Sg) boulders and Shap microgranite (Sa) clasts in the Lake District region, UK.
<p><strong><em>Non-exhaustive record (~10,000) of locations of Shap granite (Sg) boulders and Shap microgranite (Sa) clasts. Search area was limited from: in the NE, the eastern margin of Gaythorn Plain; in the NW, Shap Pink Quarry; in the SE, Farleton Fell and; in the SW, the locale of Kendal (approximate coordinates of the study area: NE: 54.499850° -2.519770°; NW: 54.468401° -2.685596°; SE: 54.226849° -2.519770°; SW: 54.227170° -2.770000°)</em></strong></p> <p>The northern limit to the study area was selected to exclude the northern plume, which disrupted the earlier eastern plume over Crosby Ravensworth Fell. The western limit was selected to enclose the known western limit of the Mint plume. The eastern limit was selected to enclose the known eastern limit of the Lune plume. The southern limit was selected to enclose the broadening of the Mint plume in the vicinity of Kendal. </p> <p>A comprehensive field survey was made of lower Borrowdale and northwards. The western Sg plume down the Mint valley south to Kendal, and the area of Lune Gorge, south of Dillicar, were surveyed cursorily, mainly checking published locations and adding additional locations encountered during this exercise. Prior reports for the Mint valley show a well-defined narrow plume, so to reduce the workload, a more complete record of locations has yet to be compiled. Similarly, from prior reports, boulder locations are few in the region around Kendal and east to the southern portion of the Lune valley and the overall distribution, before clearances, was recorded adequately in the 19<sup>th</sup> C.</p>
Camas Luinie - cup marked boulder (ScRAP 2241)
A small road travels seven miles inland from Loch Duich near the village of Dornie and ends at the small settlement of Camas-Luinie. This stone lies in an enclosed area above the road just before the village is reached (NG 94496 29091). It is intensely covered in cup marks over part of its surface. I counted just over 90, although it becomes difficult to distinguish actual cups from the natural surface. Source: Objaverse 1.0 / Sketchfab
dry creekbed boulder
Made with 3df zephyr free, using 50 images. I discovered this large rock in a dried-up seasonal creek about a mile from home. I had a camera on me, and decided to try to scan it. this is by far the largest object I have ever tried with zephyr, and it took a lot of fiddling around with the controls to get a usable file size. However, I'm quite pleased with the results, and plan to try some other larger objects in the near future! Source: Objaverse 1.0 / Sketchfab
From fine sand to boulders: examining the relationship between beach-face slope and sediment size. Dataset and references.
<p>A collection of 2144 pairs of beach-face slope and median sediment size measurements gathered from 78 publications that covers the whole range of coastal sediments.<br> </p> <p>Size-Slope-Data-Points.ods :<br> Size/slope values and their references. The 'Type' column separates beaches from boulder ridges.</p> <p>Size-Slope-References.ods :<br> Details of each reference used.</p> <p> </p>
Earthflow-Derived Boulder Size Distributions for Arroyo Hondo and the Eel River
<p>These are measured size distributions (in meters) for boulders that are supplied from earthflows in California's Franciscan Melange where they intersect channels at Oak Ridge Earthflow along Arroyo Hondo, in Central California and at the Mile 201 Slide along the Eel River, in Northern California. The dimensions reflect the minor axis length of boulders as measured from Google Earth imagery. The measurement threshold for boulders in this imagery is about 30 cm.</p>
UGA Petroglyph Boulder
This is one of two boulders with petroglyphs on dispaly in front of Baldwin Hall on the campus of the University of Georgia in Athens. The large, granite boulder modeled here has been known to settlers in[ Forsyth County](http://abob.libs.uga.edu/bobk/rockpet.html) since around the mid-19th century. This stone was gifted to the University in 1963 and has been the subject of much speculation since. There is no direct knowledge of what the symbols represent, though it is believed that they may depict constellations. Today, you can visit the beautiful UGA campus and see these petroglyphs for yourself. If you happen to be in Florida, keep an eye out for our [Archaeology Works: Stars](http://fpan.us/workshops/archworks.php) program which features this fascinating object. To learn more, click the link above. Source: Objaverse 1.0 / Sketchfab
Data from: Historical demography of four gecko species specializing in boulder cave habitat – its implications in the evolutionary dead end hypothesis and conservation
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Sand, gravel, cobbles, and boulders: Detrital thermochronology shows that one size does not tell all
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Loch Vale Watershed Research Project site, station Boulder County, CO (FIPS 8013), study of county area in units of squareKilometers on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Loch Vale Watershed Research Project (LVW) contains county area measurements in squareKilometers units and were aggregated to a yearly timescale.
Loch Vale Watershed Research Project site, station Boulder County, CO (FIPS 8013), study of number of farms in units of number on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Loch Vale Watershed Research Project (LVW) contains number of farms measurements in number units and were aggregated to a yearly timescale.
Loch Vale Watershed Research Project site, station Boulder County, CO (FIPS 8013), study of farmland acres (total) in units of acre on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Loch Vale Watershed Research Project (LVW) contains farmland acres (total) measurements in acre units and were aggregated to a yearly timescale.
Loch Vale Watershed Research Project site, station Boulder County, CO (FIPS 8013), study of population employed in commerce (percent of total) in units of percent on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Loch Vale Watershed Research Project (LVW) contains population employed in commerce (percent of total) measurements in percent units and were aggregated to a yearly timescale.
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OpenNeuro
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