Scarp retreat rates in semiarid environments from talus flatirons (Ebro Basin, NE Spain)

Quaternary-scale evolution of sequences of talus flatirons in the hyperarid Negev

“…The most common and accepted conceptual model describing the origin of talus flatiron chronosequences is based on climate changes (Everard, 1963;Gerson, 1982;Gerson and Grossman, 1987;Sancho et al, 1988;Bull, 1991;Arauzo et al, 1996;Schmidt, 1996;Gutiérrez et al, 1998Gutiérrez et al, , 2006. This model is attractive as it provides a chronological framework for landscape evolution and cliff retreat, enables the correlation between various talus flatiron remnants, and is therefore used as an example of geomorphic responses to climate change (e.g., Bull, 1991, pp.…”

Neotectônica E Evolução Do Relevo Da Região Da Serra De São Pedro E Do Baixo Piracicaba / Sudeste Do Brasil

“…Há registros de cuestas em diversas partes do mundo, como na Bacia de Paris -França (FORT & ANDRÉ, 2014), na Bacia do Ebro -Espanha (GUTIÉRREZ et al, 1998), na área adriática da região central da Itália (BUCCOLINI et al, 2007), na região de Bandiagara -Sudão (AGHASSY, 1970), no Planalto do Colorado -EUA (SCHMIDT, 1989(SCHMIDT, e 1996, na região central da Macdonnell Ranges -Austrália (TWIDALE, 2007) e na Bacia do Paraná PINHEIRO & QUEIROZ NETO, 2014), entre outros. As cuestas da Bacia do Paraná ocupam longas faixas de transição entre zonas planálticas e depressões, estendendo-se, no Brasil, segundo Almeida (1949), Ab´Saber (1965) e Pinheiro (op.…”

Slope Systems

“…Parsons et al (2006) provided empirical support for this interpretation for slopes at Walnut Gulch in Arizona. Rates of talus flatiron development have been studied by Gutiérrez et al (1998) and Gutiérrez Elorza and Sesé Martinez (2001), who studied the rates of slope evolution under flatirons in the Ebro and Almazán Basins in Northern Spain. They concluded that scarp retreat rates were of the order of 1-10 mm/a and corresponded well with changes in climate over the last 30,000 years.…”

“…In certain locations, such as the semi-arid southwestern USA (Schmidt and Meitz, 1996) and Northern Spain (Gutiérrez et al, 1998(Gutiérrez et al, , 2001, it is clear that talus slopes are currently evolving at significant rates, particularly during periods of enhanced rainfall. During drier periods, or in drier locations, flatirons tend to become disconnected from the adjacent supply of caprock material and will dissect, until bare rock substrates are exposed.…”