Interdisciplinary approach to the landscape and firewood exploitation during the Holocene at La Garrotxa (Girona, NE Iberia)

Piqué, Raquel; Revelles, Jordi; Burjachs, Francesc; Fermé, Laura Caruso; Obiol, Ramón Pérez i

doi:10.1016/j.quaint.2016.11.025

Cited by 19 publications

(15 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Ebro Basin sediments (Bastida et al, 2013); 10. Pollen record, La Garrotxa (Piqué et al, 2018); 11. Lake Estanya (González-Sampériz et al, 2017; Morellón et al, 2009); 12.…”

Section: Regional Settingunclassified

Speleothem δ¹³C record suggests enhanced spring/summer drought in south-eastern Spain between 9.7 and 7.8 ka – A circum-Western Mediterranean anomaly?

et al. 2019

View full text Add to dashboard Cite

South-eastern Spain is one of the driest regions in Europe and thus, prone to drought. Terrestrial climate records covering the late Glacial and Holocene from this area are sparse. Here, we present a flowstone record from Cueva Victoria, south-eastern Spain, which covers the late Glacial (15 ka) to the mid-Holocene (7 ka) including the Younger Dryas (YD). Between the onset of the Bølling/Allerød (B/A) and the early Holocene, flowstone δ18O values progressively decrease in accordance with sea-surface temperatures in the Alboran Sea, indicating an increase in precipitation in south-eastern Spain and a supra-regional signal of North Atlantic temperature change. At the same time, decreasing δ13C values suggest progressively increasing precipitation and vegetation density. This trend is interrupted by both colder and drier conditions during the YD. Between 9.7 ± 0.3 and 7.8 ± 0.2 ka, a large positive excursion of the δ13C values indicates a strong reduction in vegetation density, probably as a consequence of very dry spring/summer conditions. In combination with the continuously low speleothem δ18O values and a nearly unchanged growth rate, this suggests increased seasonality (i.e. drier spring/summer conditions, but not a strong reduction in annual precipitation). This is consistent with several other climate records from the Western Mediterranean region, showing that the Western Mediterranean realm (Spain, Italy) experienced pronounced spring/summer drought during this time interval. Interestingly, the timing of this dry period coincided with the African Humid Period. This may be part of a teleconnection with the North African Monsoon via the Hadley cell circulation.

show abstract

“…Ebro Basin sediments (Bastida et al, 2013); 10. Pollen record, La Garrotxa (Piqué et al, 2018); 11. Lake Estanya (González-Sampériz et al, 2017; Morellón et al, 2009); 12.…”

Section: Regional Settingunclassified

Speleothem δ¹³C record suggests enhanced spring/summer drought in south-eastern Spain between 9.7 and 7.8 ka – A circum-Western Mediterranean anomaly?

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The high frequency of L. nobilis charcoal in La Draga is unusual in other contemporary sites in Northeast of Iberian Peninsula. Indeed, in the few sites where L. nobilis has been documented from the Mesolithic to the Bronze Age it rarely represents more than 5% of the charcoal remains (Piqué et al, 2018b). Laurus Nobilis is nearly invisible in pollen records of Lake Banyoles and, in general, in the region due to the poor preservation of its pollen grains.…”

Section: Discussionmentioning

confidence: 99%

Buxus sempervirens and Laurus nobilis leaves from an archaeological site at 7300 cal BP (La Draga, Spain) provide a better understanding of past vegetation and human activities

et al. 2020

View full text Add to dashboard Cite

Leaves are valuable, but very rare, remains in archaeological contexts, as they can provide precise information on the landscape vegetation composition, the past climatic conditions and the use of plant resources in a settlement. La Draga (Spain) is an early Neolithic site partially waterlogged, which has allowed the preservation of organic material. During the excavation of the oldest level (7300–7000 cal BP), we recovered 29 leaf samples in an optimal state of preservation. Here we explore the potential of these leaves as indicators both of the use of vegetation at the settlement and of past climatic conditions. Firstly, we determined the species identity by comparing the leaf morphological and microanatomical traits with those of contemporary individuals. Secondly, we analyzed the leaf stomatal patterning (stomatal density, index, and size) as proxies of paleoclimate during the Neolithic, when lower atmospheric CO2 and wetter conditions are documented. The leaves of La Draga were identified as Laurus nobilis and Buxus sempervirens, two evergreen species well documented at the site from other archaeobotanical records, such as charcoal and wooden implements. We found no differences in stomatal traits between the archaeological and the contemporary leaves of L. nobilis and B. sempervirens, which shows the limitation of stomatal frequency as proxies for CO2. The presence of these species at the site provides good complementary data for past woodland vegetation composition and the production of wood implements. The wide distribution of L. nobilis leaves across the site suggests that this taxon was present in the riparian forest at the site surroundings. In contrast, leaves of B. sempervirens were grouped together, which might indicate that they belonged to the same branch, probably transported as raw material from nearby forests to the settlement. This study illustrates the value of archaeological leaves to provide a better understanding on the past vegetation and human activities.

show abstract

“…Quiescence phases between the eruptive periods were long enough to allow the formation of decimetre-thick paleosols and metric erosive down-cuts (gully erosion and paleo-streams formation). The integration of the UBSU stratigraphy, the absolute chronology, and several studies on the climate changes in the Iberian Peninsula during the last 300 ka (Burjachs and Allué 2003;Morellón et al 2009;González-Sampériz et al 2010;Höbig et al 2012;Puiguriguer et al 2012;Piqué et al 2018;Table 4) revealed that the firstorder unconformities recognized in the central GVF could have a climatic significance. These unconformities may thus be searched for outside the area studied here, where they may Fig.…”

Section: Climatic Interpretation Of the Sedimentological Recordsmentioning

confidence: 98%

Hydrogeomorphic and sedimentary response to the Late Pleistocene violent Strombolian eruption of the Croscat volcano (Garrotxa Volcanic Field, Spain)

Traglia

2020

Med. Geosc. Rev.

View full text Add to dashboard Cite

Explosive eruptions can severely alter the boundary conditions of fluvial systems around volcanoes by depositing large volumes of erodible fragmental material, increasing erosion rate and drainage mass flux (water and sediment) in the affected basin. In this paper, the environmental response to the 13 ka Croscat Violent Strombolian eruption in the Garrotxa Volcanic Field (NE Spain) has been investigated using a stratigraphic approach. Volcaniclastic material was mainly delivered at headwater tributaries (Les Tries plain in the Ser river basin) of the Fluvià River, one of the main drainage systems of NE Spain. Deposits in the Les Tries valley was initially reworked by hyperconcentrated-flows to braided stream-flows and by debris-flows involving mixed terrains (volcaniclastic materials and sands-gravels of the Eocene sedimentary basement) as registered in the stratigraphic record. The erosive pattern observed at the Les Tries valley reflects the erosion model of wellsorted and coarse-grained deposits (as the tephra deposited during the Violent Strombolian phase of the Croscat eruption), in which deep gullying and downstream aggradation are typically retarded where coarse tephra deposits remained highly permeable. Moreover, the Croscat eruption occurred soon after the Last Glacial Maximum, implying the shift from dry to wet conditions during the remobilization of the Croscat tephra. In this framework, the semiarid conditions retarded soil stabilization, driving the development of hyperconcentrated-flow-dominated alluvial fans, whereas the more humid environmental conditions favoured the partial stabilization of loose pyroclastic material, until it is periodically remobilization by mass-wasting processes as debris-flow-dominated lahars.

show abstract

Interdisciplinary approach to the landscape and firewood exploitation during the Holocene at La Garrotxa (Girona, NE Iberia)

Cited by 19 publications

References 62 publications

Speleothem δ¹³C record suggests enhanced spring/summer drought in south-eastern Spain between 9.7 and 7.8 ka – A circum-Western Mediterranean anomaly?

Speleothem δ¹³C record suggests enhanced spring/summer drought in south-eastern Spain between 9.7 and 7.8 ka – A circum-Western Mediterranean anomaly?

Buxus sempervirens and Laurus nobilis leaves from an archaeological site at 7300 cal BP (La Draga, Spain) provide a better understanding of past vegetation and human activities

Hydrogeomorphic and sedimentary response to the Late Pleistocene violent Strombolian eruption of the Croscat volcano (Garrotxa Volcanic Field, Spain)

Contact Info

Product

Resources

About

Interdisciplinary approach to the landscape and firewood exploitation during the Holocene at La Garrotxa (Girona, NE Iberia)

Cited by 19 publications

References 62 publications

Speleothem δ13C record suggests enhanced spring/summer drought in south-eastern Spain between 9.7 and 7.8 ka – A circum-Western Mediterranean anomaly?

Speleothem δ13C record suggests enhanced spring/summer drought in south-eastern Spain between 9.7 and 7.8 ka – A circum-Western Mediterranean anomaly?

Buxus sempervirens and Laurus nobilis leaves from an archaeological site at 7300 cal BP (La Draga, Spain) provide a better understanding of past vegetation and human activities

Hydrogeomorphic and sedimentary response to the Late Pleistocene violent Strombolian eruption of the Croscat volcano (Garrotxa Volcanic Field, Spain)

Contact Info

Product

Resources

About

Speleothem δ¹³C record suggests enhanced spring/summer drought in south-eastern Spain between 9.7 and 7.8 ka – A circum-Western Mediterranean anomaly?

Speleothem δ¹³C record suggests enhanced spring/summer drought in south-eastern Spain between 9.7 and 7.8 ka – A circum-Western Mediterranean anomaly?