Abstract
Interpretation of sea-level indicators is essential when studying paleo sea-level fluctuations during the Holocene. Sea-level indicators may have different origins, such as geological (beachrocks) and biological (vermetids and barnacles). In order to reconstruct paleo sea-level, it is necessary to attribute an indicative meaning to each sea-level indicator. This paper aims to discuss issues raised by Angulo et al. (2016) regarding to the sea-level fluctuations curve proposed by Castro et al. (2014) to the Rio de Janeiro State coast, Brazilian southeast. The key issue that deserves posing is that local or regional curves cannot be built based on large scale (global) RSL geophysical models even in places of steady crust like Brazil. Here, we put into question the relative sea-level fluctuation curve model proposed by Angulo et al. (2006, 2016) to the coast of Rio de Janeiro State and Pernambuco State. It is strengthened the proposal of using different origins indicators on RSL vertical variation, georeferenced by high precision altitude GPS, adjusted by Brazilian Geodetic System benchmarks, maintained by the Brazilian Institute of Geography and Statistics - IBGE. All issues regarding the curve drawn by Castro et al. (2014) are answered based on field data, laboratory analytical techniques, radiocarbon dating as well as relevant literature.
Highlights
We appreciate Angulo et al (2016) comments and the opportunity to discuss some important aspects related to sea-level fluctuation and coastal evolution in southeastern Brazil
Among them the fact that there is no single curve of global variation even in regions of stable crust like Brazil (Martin et al 1998)
The idea of paleo sea-level higher than the current during Holocene was accepted with a degree of reluctance since it was contrary to the United States east coast curve, which shows an ongoing ascension at the same time interval
Summary
We appreciate Angulo et al (2016) comments and the opportunity to discuss some important aspects related to sea-level fluctuation and coastal evolution in southeastern Brazil. Among them the fact that there is no single curve of global variation even in regions of stable crust like Brazil (Martin et al 1998). This finding has pushed for new researches aiming RSL curves all around the world. Suguio et al (1985) have proposed that paleo sea-level have dropped from 4,0 m to 5,0 m in the last 5.500 years in the Brazilian east coast. The idea of paleo sea-level higher than the current during Holocene was accepted with a degree of reluctance since it was contrary to the United States east coast curve, which shows an ongoing ascension at the same time interval
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