Holocene Coastal Sedimentation in a Rocky Environment: Geomorphological Evidence from the Aran Islands and Galway Bay (Western Ireland)

Erdmann, Wibke; Scheffers, Anja; Kelletat, Dieter

doi:10.2112/jcoastres-d-17-00175.1

Cited by 13 publications

(5 citation statements)

References 65 publications

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“…The information from this locality fills an important gap in the knowledge of the geographical distribution of coastal megaclast deposits along the Atlantic coast of Europe. These deposits were reported previously from the British Isles [21,[27][28][29][30][31][32][33][34][35][45][46][47][48][49][50][51], northern France (first of all, Brittany) [52][53][54][55][56], and the western and southwestern coasts of the Iberian Peninsula [57][58][59][60][61]. The Hondarribia locality represents the other domain, i.e., the Biscay Bay, the coasts of which are prone to severe storms creating and transporting megaclasts, similarly to the above-mentioned regions [62].…”

Section: Example 1: Hondarribia (Spain; Biscay Bay)supporting

confidence: 55%

“…Irrespective of which of these aspects and particular opinions to follow, finding new localities coastal megaclast deposits is of utmost importance. The knowledge from the 'classical' localities like those studied in the Bahamas [6,7] and western Ireland [29][30][31][32][33][34][35] need extension and refinement with the information from many other localities of the world. Although megaclast studies are urgent and relatively cheap, the circle of the involved researchers remains too restricted to expect documentation of even a triple of all megaclast localities.…”

Section: Introductionmentioning

confidence: 99%

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Finding Coastal Megaclast Deposits: A Virtual Perspective

Ruban

2020

JMSE

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Coastal megaclast deposits are dominated by detrital particles larger than 1 m in size. These attract significant attention of modern researchers because of the needs of sedimentary rock nomenclature development and interpretation of storm and tsunami signatures on seashores. If so, finding localities that exhibit coastal megaclast deposits is an important task. Field studies do not offer a quick solution, and, thus, remote sensing tools have to be addressed. The application of the Google Earth Engine has permitted to find four new localities, namely Hondarribia in northern Spain (Biscay Bay), the Ponza Island in Italy (Tyrrhenian Sea), the Wetar Island in eastern Indonesia (Banda Sea), and the Humboldt o Coredo Bay at the Colombia/Panama border (eastern Pacific). In these localities, coastal megaclast deposits consisting of blocks (1–10 m in size) and some megablocks (>10 m in size) are delineated and preliminary described in regard to the dominant size of particles, package density, mode of occurrence, etc. The limitations of such virtual surveys of coastal megaclast deposits are linked to an insufficiently high resolution of satellite images, as well as ‘masking’ effects of vegetation cover and cliff shadows. However, these limitations do not diminish the importance of the Google Earth Engine for finding these deposits. Consideration of some tourism-related information, including photos captured by tourists and bouldering catalogues, facilitates search for promising areas for subsequent virtual surveying of megaclast distribution. It is also established that the Google Earth Engine permits quantitative analysis of composition of coastal megaclast deposits in some areas, as well as to register decade-long dynamics or stability of these deposits, which is important to interpret their origin. The current opportunities for automatic detection of coastal megaclast deposits seem to be restricted.

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Section: Example 1: Hondarribia (Spain; Biscay Bay)supporting

confidence: 55%

Section: Introductionmentioning

confidence: 99%

Finding Coastal Megaclast Deposits: A Virtual Perspective

Ruban

2020

JMSE

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“…Similar-size rhyolite boulders at Ensenada Almeja (Figure 1b, locality 3) occur at sea level adjacent to the sea cliffs from which they were extracted [3]. Elsewhere, major CBDs occur atop sea cliffs in northern France [27] and western Ireland [28,29]. Mega-boulders left high above sea level but close to the parent bed rock from which they were eroded also are known from the Bahamas and Bermuda [30,31].…”

Section: Comparisons With Other Coastal Boulder Depositsmentioning

confidence: 90%

Holocene Hurricane Deposits Eroded as Coastal Barriers from Andesite Sea Cliffs at Puerto Escondido (Baja California Sur, Mexico)

Johnson

Guardado-France

et al. 2020

JMSE

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Previous studies on the role of hurricanes in Mexico’s Gulf of California examined coastal boulder deposits (CBDs) eroded from limestone and rhyolite sea cliffs. Sedimentary and volcanic in origin, these lithotypes are less extensively expressed as rocky shores than others in the overall distribution of gulf shores. Andesite that accumulated as serial volcanic flows during the Miocene constitutes by far the region’s most pervasive rocky shores. Here, we define a subgroup of structures called barrier boulder deposits (BBDs) that close off lagoons as a result of lateral transport from adjacent rocky shores subject to recurrent storm erosion. Hidden Harbor (Puerto Escondido) is the most famous natural harbor in all of Baja California. Accessed from a single narrow entrance, it is commodious in size (2.3 km2) and fully sheltered by outer andesite hills linked by two natural barriers. The average weight of embedded boulders in a succession of six samples tallied over a combined distance of 710 m ranges between 74 and 197 kg calculated on the basis of boulder volume and the specific gravity of andesite. A mathematical formula is utilized to estimate the wave height necessary to transport large boulders from their source. Average wave height interpreted by this method varies between 4.1 and 4.6 m. Input from fossil deposits and physical geology related to fault trends is applied to reconstruct coastal evolution from a more open coastal scenario during the Late Pleistocene 125,000 years ago to lagoon closure in Holocene time.

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“…On the other hand, boulders are regarded as precious evidence of present and ancient rocky shore facies and extreme events (such as storms, tsunamis, hurricanes, typhoons, and cyclones). This evidence has been examined by Autret et al [5], Bhatt et al [6], Biolchi et al [7], Cox et al [8][9][10], Dawson [11], Engel et al [12], Erdmann et al [13], Hearty and Tormey [14], Herterich et al [15], Hongo et al [16], Johnson et al [17,18], Kennedy et al [19], Kortekaas and Dawson [20], Lau et al [21], Olsen et al [22], Paris et al [23], Pepe et al [24], Scheffers et al [25], Schneider et al [26], Shah-Hosseini et al [27], Suanez et al [28], Terry and Goff [29], Terry et al [30], Trenhaile [31], Watanabe et al [32], and Weiss and Sheremet [33]. Most probably, the devastating catastrophes like the 2004 Indian Ocean tsunami [34] and the 2011 Tohoku tsunami [35] have fueled the interest of researchers in coastal sedimentology and, particularly, large clasts [36].…”

Section: Introductionmentioning

confidence: 94%

Coastal Boulder Deposits of the Neogene World: A Synopsis

Ruban

2019

JMSE

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Modern geoscience research pays significant attention to Quaternary coastal boulder deposits, although the evidence from the earlier geologic periods can be of great importance. The undertaken compilation of the literature permits to indicate 21 articles devoted to such deposits of Neogene age. These are chiefly case studies. Such an insufficiency of investigations may be linked to poor preservation potential of coastal boulder deposits and methodological difficulties. Equal attention has been paid by geoscientists to Miocene and Pliocene deposits. Taking into account the much shorter duration of the Pliocene, an overemphasis of boulders of this age becomes evident. Hypothetically, this can be explained by more favorable conditions for boulder formation, including a larger number of hurricanes due to the Pliocene warming. Geographically, the studies of the Neogene coastal boulder deposits have been undertaken in different parts of the world, but generally in those locations where rocky shores occur nowadays. The relevance of these deposits to storms and tsunamis, rocky shores and deltas, gravity processes, and volcanism has been discussed; however, some other mechanisms of boulder production, transportation, and accumulation (e.g., linked to seismicity and weathering) have been missed.

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Holocene Coastal Sedimentation in a Rocky Environment: Geomorphological Evidence from the Aran Islands and Galway Bay (Western Ireland)

Cited by 13 publications

References 65 publications

Finding Coastal Megaclast Deposits: A Virtual Perspective

Finding Coastal Megaclast Deposits: A Virtual Perspective

Holocene Hurricane Deposits Eroded as Coastal Barriers from Andesite Sea Cliffs at Puerto Escondido (Baja California Sur, Mexico)

Coastal Boulder Deposits of the Neogene World: A Synopsis

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