Credit: Newcastle University (Phys.org) —A massive ancient subglacial trough – deeper than the Grand Canyon - has been discovered by a team of UK experts. 
 
 The research involved scientists from Newcastle University, the University of Bristol's Glaciology Centre, the British Antarctic Survey and the universities of Edinburgh, Exeter, and York. They charted the Ellsworth Subglacial Highlands – an ancient mountain range buried beneath several kilometres of Antarctic ice - by combining data from satellites and ice-penetrating radars towed behind skidoos and on-board small aircraft. 
 
 The researchers spent three seasons investigating and mapping the region in West Antarctica, uncovering a massive subglacial valley up to 3 kilometres deep, more than 300 kilometres long and up to 25 kilometres across. In places, the floor of this valley is more than 2000 metres below sea level. 
 
 The mountain range and deep valley were carved millions of years ago by a small icefield similar to those of the present-day Antarctic Peninsula, or those of Arctic Canada and Alaska. 
 
 Professor Martin Siegert, Professor of Geosciences at the University of Bristol, said: "While the idea of West Antarctic Ice Sheet growth and decay over the past few million years has been discussed for decades, the precise location where the ice sheet may originate from in growth phases, and decay back to in periods of decay, has not been known. 
 
 "By looking at the topography beneath the ice sheet using a combination of ice-penetrating radio-echo sounding and satellite imagery, we have revealed a region which possesses classic glacial geomorphic landforms, such as u-shaped valleys and cirques, that could only have been formed by a small ice cap, similar to those seen at present in the Canadian and Russian High Arctic. The region uncovered is, therefore, the site of ice sheet genesis in West Antarctica." 
 
 The team's analysis has provided an unprecedented insight into the extent, thickness and behaviour of this ancient icefield, and the configuration and behaviour of the early West Antarctic Ice Sheet. The subglacial landscape shows where and how the West Antarctic Ice Sheet originated and grew. It also provides important clues about the size and shape of the ice sheet in West Antarctica in a warmer global climate. 
 
 The findings are published in the latest edition of the Geological Society of America Bulletin. The paper's lead author Dr Neil Ross, from Newcastle University, said: "The discovery of this huge trough, and the characterisation of the surrounding mountainous landscape, was incredibly serendipitous. 
 
 "We had acquired ice penetrating radar data from both ends of this huge hidden valley, but we had no information to tell us what was in between. Satellite data was used to fill the gap, because despite being covered beneath several kilometres of ice, the valley is so vast that it can be seen from space. 
 
 "To me, this just goes to demonstrate how little we still know about the surface of our own planet. The discovery and exploration of hidden, previously-unknown landscapes is still possible and incredibly exciting, even now." 
 
 Explore further: West Antarctic ice sheet formed earlier than thought 
 
 More information: Neil Ross, Tom A. Jordan, Robert G. Bingham, Hugh F.J. Corr, Fausto Ferraccioli, Anne Le Brocq, David M. Rippin, Andrew P. Wright, and Martin J. Siegert. "The Ellsworth Subglacial Highlands: Inception and retreat of the West Antarctic Ice Sheet." Geological Society of America Bulletin, January 2014, v. 126, no. 1-2, p. 3-15, first published on September 19, 2013, DOI: 10.1130/B30794.1 
 
 ||||| Download Fiscal Year 2009-2010 Accomplishment Report (2.85 MB PDF File) 
 
 
 
 Download Grand Canyon National Park Profile 2014 (368 kb PDF File) 
 
 
 
 Download Compendium Of Designations, Closures, Use and Activity Restrictions, Permit Requirements And Other Regulations 
 
 Updated August 2014 (563 kb PDF File) 
 
 
 
 Superintendent's Compendium 2014 Summary of Changes 
 
 (136 kb PDF file) Items that have been modified, added or deleted since the 2013 approval. Updated August 2014 
 
 
 
 
 
 General Grand Canyon National Park Visitation Statistics 
 
 Year to Date Reports 
 
 Monthly Public Use Reports 
 
 Annual Park Visitation (all years) 
 
 Visitation by Month/ Year 
 
 Park Fiscal Year Report 
 
 How We Count 
 
 Visitation Comments by Park Staff 
 
 Are available from the NPS Stats Website 
 
 (The right-hand column displays the Grand Canyon Reports) 
 
 Grand Canyon National Park Visitor Transportation System Statistics 
 
 
 
 Passenger Statistics by Route and Costs, 1974 to 2005 (22kb PDF File) 
 
 
 
 Passenger Statistics by Month, 1974 to 2005 (19kb PDF File) 
 
 
 
 Vehicle Information Updated 2005 (28kb PDF File)
– It looks like the Grand Canyon has some pretty stiff competition near both poles. In August, scientists announced they had found a Greenland canyon that dwarfs the famed one in Arizona. Now, researchers have repeated the feat—and then some—in the Antarctic. Phys.Org reports that a group of UK scientists used satellites and radar to study the Ellsworth Subglacial Highlands, an ancient mountain range buried under more than a mile of ice in West Antarctica. What they found: a mammoth valley almost 1.9 miles deep in places, now named the Ellsworth Trough. As Gizmodo points out, that's much deeper than the Grand Canyon, which is up to a mile deep. The discovery of the canyon, which measures nearly 200 miles long and up to 15 miles wide, beneath so much ice was a find that lead author Dr. Neil Ross describes as "incredibly serendipitous." While the team had data from both ends of the trough from ice-penetrating radar, they didn't know what existed between, and had to rely on NASA satellite data to fill that hole—or, as it were, uncover one. Because, as Ross explains, even beneath all that ice, "the valley is so vast that it can be seen from space." He adds, "To me, this just goes to demonstrate how little we still know about the surface of our own planet." (Click for more on the canyon found in Greenland, which is grander than the Grand Canyon in one regard.)