On the formation of sand ramps: a case study from the Mojave Desert

Mark D Bateman, Robert G Bryant, Ian D L Foster, Ian Livingstone, A J Parsons

Research output: Contribution to ConferencePaper

Abstract

Sand ramps are dune-scale sedimentary accumulations found at mountain fronts and consist of a combination of aeolian sands and stone layers resulting from other geomorphological processes associated with hillslope and fluvial activity. Their complexity and their construction by wind, water and mass movement means that sand ramps potentially hold a very rich store of palaeoenvironmental information. However, before this potential can be realised a full understanding of their formation is necessary. Our new work based on the evidence from the Soldier Mountain sand ramp in the Mojave desert, that their formation appears strongly controlled by a ‘window of opportunity’ when sediment supply is plentiful and cease to develop when this sediment supply diminishes and/or the accommodation space is filled up. Contemporary observations of stone movement indicate movement rates insufficiently fast to explain how stone horizons could have been moved across and been incorporated into sand ramps on multiple occasions. Stone horizons found within the aeolian sediments lack evidence for soil development and are interpreted as very short-term events in which small streams moved and splayed discontinuous stone horizons across the sand ramp surface before aeolian deposition resumed. Our study suggests that sand ramps cannot easily be interpreted in terms of a simple model of fluctuating palaeoenvironmental phases from Aeolian dominated to soil/fluvial/colluvial dominated episodes. As a result their palaeoenvironmental significance and indeed how sand ramps are distinguished from other dune forms require amendment
Original languageEnglish
DOIs
Publication statusPublished - 1 Sep 2012
EventSouthern African Association of Geomorphologists (SAAG) Biennial Conference - Gobabeb, Namibia
Duration: 1 Sep 2012 → …
http://www.sasqua.net/meetings-um.htm

Conference

ConferenceSouthern African Association of Geomorphologists (SAAG) Biennial Conference
Period1/09/12 → …
Internet address

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desert
sand
dune
sediment
mountain
mass movement
hillslope
soil
stone
water

Cite this

Bateman, M. D., Bryant, R. G., Foster, I. D. L., Livingstone, I., & Parsons, A. J. (2012). On the formation of sand ramps: a case study from the Mojave Desert. Paper presented at Southern African Association of Geomorphologists (SAAG) Biennial Conference, . https://doi.org/10.1016/j.geomorph.2012.04.004
Bateman, Mark D ; Bryant, Robert G ; Foster, Ian D L ; Livingstone, Ian ; Parsons, A J. / On the formation of sand ramps: a case study from the Mojave Desert. Paper presented at Southern African Association of Geomorphologists (SAAG) Biennial Conference, .
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Bateman, MD, Bryant, RG, Foster, IDL, Livingstone, I & Parsons, AJ 2012, 'On the formation of sand ramps: a case study from the Mojave Desert', Paper presented at Southern African Association of Geomorphologists (SAAG) Biennial Conference, 1/09/12. https://doi.org/10.1016/j.geomorph.2012.04.004

On the formation of sand ramps: a case study from the Mojave Desert. / Bateman, Mark D; Bryant, Robert G; Foster, Ian D L; Livingstone, Ian; Parsons, A J.

2012. Paper presented at Southern African Association of Geomorphologists (SAAG) Biennial Conference, .

Research output: Contribution to ConferencePaper

TY - CONF

T1 - On the formation of sand ramps: a case study from the Mojave Desert

AU - Bateman, Mark D

AU - Bryant, Robert G

AU - Foster, Ian D L

AU - Livingstone, Ian

AU - Parsons, A J

PY - 2012/9/1

Y1 - 2012/9/1

N2 - Sand ramps are dune-scale sedimentary accumulations found at mountain fronts and consist of a combination of aeolian sands and stone layers resulting from other geomorphological processes associated with hillslope and fluvial activity. Their complexity and their construction by wind, water and mass movement means that sand ramps potentially hold a very rich store of palaeoenvironmental information. However, before this potential can be realised a full understanding of their formation is necessary. Our new work based on the evidence from the Soldier Mountain sand ramp in the Mojave desert, that their formation appears strongly controlled by a ‘window of opportunity’ when sediment supply is plentiful and cease to develop when this sediment supply diminishes and/or the accommodation space is filled up. Contemporary observations of stone movement indicate movement rates insufficiently fast to explain how stone horizons could have been moved across and been incorporated into sand ramps on multiple occasions. Stone horizons found within the aeolian sediments lack evidence for soil development and are interpreted as very short-term events in which small streams moved and splayed discontinuous stone horizons across the sand ramp surface before aeolian deposition resumed. Our study suggests that sand ramps cannot easily be interpreted in terms of a simple model of fluctuating palaeoenvironmental phases from Aeolian dominated to soil/fluvial/colluvial dominated episodes. As a result their palaeoenvironmental significance and indeed how sand ramps are distinguished from other dune forms require amendment

AB - Sand ramps are dune-scale sedimentary accumulations found at mountain fronts and consist of a combination of aeolian sands and stone layers resulting from other geomorphological processes associated with hillslope and fluvial activity. Their complexity and their construction by wind, water and mass movement means that sand ramps potentially hold a very rich store of palaeoenvironmental information. However, before this potential can be realised a full understanding of their formation is necessary. Our new work based on the evidence from the Soldier Mountain sand ramp in the Mojave desert, that their formation appears strongly controlled by a ‘window of opportunity’ when sediment supply is plentiful and cease to develop when this sediment supply diminishes and/or the accommodation space is filled up. Contemporary observations of stone movement indicate movement rates insufficiently fast to explain how stone horizons could have been moved across and been incorporated into sand ramps on multiple occasions. Stone horizons found within the aeolian sediments lack evidence for soil development and are interpreted as very short-term events in which small streams moved and splayed discontinuous stone horizons across the sand ramp surface before aeolian deposition resumed. Our study suggests that sand ramps cannot easily be interpreted in terms of a simple model of fluctuating palaeoenvironmental phases from Aeolian dominated to soil/fluvial/colluvial dominated episodes. As a result their palaeoenvironmental significance and indeed how sand ramps are distinguished from other dune forms require amendment

U2 - http://dx.doi.org/10.1016/j.geomorph.2012.04.004

DO - http://dx.doi.org/10.1016/j.geomorph.2012.04.004

M3 - Paper

ER -

Bateman MD, Bryant RG, Foster IDL, Livingstone I, Parsons AJ. On the formation of sand ramps: a case study from the Mojave Desert. 2012. Paper presented at Southern African Association of Geomorphologists (SAAG) Biennial Conference, . https://doi.org/10.1016/j.geomorph.2012.04.004