A Spanish Cave Guards the Earliest Fire of Stone Age Europe...

Firm evidence of fire 800,000 years ago, published in Antiquity June 2016 (1), comes from the southeastern Spanish Palaeolithic site with a late Early Pleistocene fauna which is the Cueva Negra del Estrecho del Río Quípar (“Black Cave of the R. Quípar Gorge”).

Systematic excavation of this large rock-shelter A Spanish Cave Guards the Earliest Fire of Stone... 1began in 1990 and ongoing excavations are conducted under the auspices of MUPANTQUAT, the Murcian Association for the Study of Palaeoanthropology and the Quaternary and its annual Field School, www.mupantquat.com.

Indications of ancient fire were uncovered first in 2011 in a closed sedimentary deposit sealed below a depth of 4.5 metres of overlying archaeological layers (2). All the layers are shown by magnetostratigraphy as being earlier than the boundary at 780,000 years ago  between the Matuyama and Brunhes magnetochrons (3), and contain remains of both large and small mammals that existed in Spain between one million and 700,000 years ago (4). Pollen analysis and bird remains including water-fowl (5, 6, 7), together with sedimentary analysis (8), indicate mild moist conditions with an erstwhile swampy lake beside the cave, suggesting the interglacial time 860,000-810,000 years ago of marine isotope stage 21. Guided by a precautionary principle concerning assessment of very fragmentary mammalian fossils, publications before 2009 had assigned the sedimentary accumulation to the Middle Pleistocene. Later excavations have increased numbers of fossils and their detailed palaeontological examination shows that the faunal composition is typical of the end of the Early Pleistocene in Spain and the dawn of the Middle Pleistocene.

Convincing evidence of combustion at Cueva Negra has been established thanks to generous international collaboration with MUPANTQUAT by scientists in Spain, Germany, USA, Italy and Canada, who have employed contrasting analytical methods that converge in their conclusions (1):
Thermoluminescence, TL: chert (flint) had been heated at >400°C.
Low and high-power microscopy confirm thermally-altered chert (flint).
Fourier Transform infrared spectroscopy, FTIR: bone had been heated at >400-450ºC though below <700-800ºC.
Electron spin resonance palaeothermometry, ESR: bone had been heated at >400-450ºC.
Scanning scanning electron microscopy, SEM, and energy-dispersive spectroscopy, EDAX: showdiscolouration of bone owes to thermal alteration (not to staining by iron or manganese oxides).
Taphonomical analysis of 2,300 micromammalian bones: statistical analysis of calcined and markedly thermally-discoloured bones vis-à-vis relatively less altered bones found significant proportional differences between layers with and without other signs of combustion.

Sedimentological macroscopical and micromorphological comparison of different layers
Chemical and mineral comparison of different sedimentary layers by thermogravimetrical analysis with mass spectrometry,  granulometry by laser diffraction, X-ray fluorescence, XRF, and X-ray diffraction, XRD, studies; hydroxyapatite (2.5%) in the altered sediment is compatible with degradation of bone.

Whilst the most we can say at present is that we have A Spanish Cave Guards the Earliest Fire of Stone 2incontrovertible evidence of a place where there was combustion, a bonfire if you like, and we do not know yet the extent of its area, it is nevertheless a most significant discovery because of  both its great antiquity and the intriguing Palaeolithic finds from the cave which range from an “Acheulian” hand-axe fashioned on an oval limestone cobble to small artifacts on chert (flint), brought from both nearby and distant raw-material sources (10), including flakes removed by repetitive recurrent flaking of small cores (2, 4, 9), comprising an assemblage showing instances of Modes A, B, C, D, E, F, and G, in terms of Shea’s novel approach to stone tools (11, 12).

That variety implies cognitive versatility, manual dexterity, and technical skilfulness, among which behaviour involving fire is hardly out of place, and which also seem to have characterized other early sites with strong evidence of combustion, such as Wonderwerk Cave in South Africa around one million years ago and Gesher Benoth Ya’akov in Israel around 780,000 years ago, at both of which, coincidentally, hand-axes have been excavated – though this need not imply diffusion to western Europe where fashioning the earliest hand-axes may have arisen independently (13).

It would be imprudent to conjecture that such coincidences reflect the handiwork or behaviour of a single species of ancient Homo, whether H. erectus, H. antecessor, or H. heidelbergensis (putative archaic teeth reported from Cueva Negra are subject to ongoing critical scrutiny). The important matter for Palaeoanthropology to consider is the widespread capacity among late Early Pleistocene humans for behaving in ways that may have helped them to survive in disparate Old World environments.

The part played by fire in early human evolution is an, er, hot potato. At some Early Pleistocene sites traces of combustion could owe to bush fires or even glowing volcanic ash, especially at open sites in dry A Spanish Cave Guards the Earliest Fire of Stone... 3landscapes. At Cueva Negra, however, it is unlikely that flying sparks from a bush fire outside ignited brushwood inside, causing a roaring blaze and a temperature of >400ºC. Moreover, Cueva Negra and Genoth Benoth Ya’akov were beside rivers. Plausibly, smouldering brands left by bush fires were carried into Wonderwerk Cave and Cueva Negra so that fire could be tended where rain or wind could not put it out. No fire-pit or hearth stones have been found at Cueva Negra, hence it is unlikely that the heat of a tended fire could be controlled.

The denizens of Cueva Negra may have been less afraid of fire outside than animals they saw fleeing from it. That may have induced them to meddle with fire in order to drive animals towards natural death-traps, such as swamps, where they could be dismembered. A tended fire in a cave could serve several different purposes at the same time, such as deterring the approach of fierce animals, providing warmth, or roasting food.

Were foodstuffs roasted or cooked at Cueva Negra? It is impossible to say. Cogent physiological arguments (14) imply that cooking could have played a part in human evolution from at least 1.5 Ma, and, plausibly, influenced the expansion of brain volume (15), thanks to the enhanced digestion and absorption of nutrients which cooking afforded to pregnant women, lactating mothers, growing infants, children, and adolescents. Nevertheless, hearths seem to be absent from Palaeolithic sites before half-a-million years ago. We still cannot say when or where early humans first began to control the heat of a fire and engage in regular cookery.

(Information provided by Michael J. Walker, Emeritus Professor, Department of Zoology & Physical Anthropology, Murcia, University, and Chair of  MUPANTQUAT:  mjwalke@gmail.com)

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