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The Bound Cavern armpit in the KwaZulu-Natal arena of South Africa has been a affluent antecedent of archaeological adeptness about Stone Age bodies because of its well-preserved stratigraphic record. Wadley et al. now address the assay of grass bedding in Bound Cave, anachronous to about 200,000 years ago. The bedding, articular with a ambit of diminutive and spectroscopic techniques, was circuitous with layers of ash. It additionally congenital bits from lithics, austere bone, and angled amber grains, all of which were of bright anthropogenic origin. The authors brainstorm that the ash may accept been advisedly acclimated in bedding to arrest the movement of ticks and added arthropod irritants. These discoveries extend the almanac of advised architecture of bulb bedding by at atomic 100,000 years.

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Science, this affair p. 863

Early bulb use is hardly declared in the archaeological almanac because of poor preservation. We address the assay of grass bedding acclimated to actualize adequate areas for sleeping and alive by bodies who lived in Bound Cavern at atomic 200,000 years ago. Sheaves of grass acceptance to the broad-leafed Panicoideae subfamily were placed abreast the aback of the cavern on ash layers that were about debris of bedding austere for armpit maintenance. This action is one advertiser of more-complex behavior that is archaeologically apparent from ~100,000 years ago.

About 1 actor years ago, an brief blaze was lit in Wonderwerk Cave, South Africa (1), and traces of blaze accept been anachronous to 1.5 actor years ago at the accessible bivouac FxJj20 in Koobi Fora, Kenya (2). Blaze was acclimated in the Spanish basement apartment Cueva Negra del Estrecho del Río Quípar 800,000 years (800 ky) ago (3), and it was acclimated 780 ky ago at the amphitheater armpit Gesher Benot Ya’akov, Israel (4). These attenuate aboriginal occurrences advance the expedient agriculture of fire—for example, from lightning strikes—whereas ample hearths and affirmation for assorted uses of calefaction betoken the adeptness to aftermath blaze at will. After ~400 ky ago, blaze appeared consistently in archaeological sites (5–8), area it was apparently acclimated for cooking, heating, light, socializing, and aegis from predators.

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In this work, we present affirmation for added uses of fire, and its products, afore 200 ky ago. Bodies inhabiting Bound Cave, South Africa, systematically placed attic coverings (bedding) of broad-leafed grass aloft ash layers, set hearths nearby, and occasionally austere their bedding. Afore this discovery, the oldest-known bulb bedding was 77 ky old from Sibudu, South Africa (9), and adolescent examples were begin to action in added archaeological sites (10–12). At Sibudu, layered bracken was busy with alleviative plants, and dried bedding was sometimes austere (9). Bound Cavern abstracts announce that such practices began far earlier.

Border Cavern is amid in the Lebombo Mountains of KwaZulu-Natal, on the eSwatini bound (fig. S1). Excavations amid 2015 and 2019 (13) (Fig. 1A) accept yielded archaeobotanical abstracts (14) not retrieved ahead (15). The cavern was active intermittently from afore 227 ky ago until ~1000 CE (16) (table S1), and it is fabricated up of alternating amber beach (BS) and white ash (WA) stratigraphic associates (15). Member 6 Amber Beach (6 BS) rests on cavern basement (Fig. 1B and fig. S2). Aloft this is Member 5 White Ash (5 WA), the abject and top of which accept ages of 227 ± 11 and 183 ± 20 (means and accepted error) ky ago, appropriately (17). 6 BS is undated, so the alpha date of >300 ky ago for 5 WA that has been appropriate by Bayesian clay may be abstract (18). Hearths, ash layers (fig. S2), and grass bedding (table S2) are arresting throughout the Bound Cavern arrangement (13). Stratigraphic profiles (13) actualization that bedding of all ages is about amid in the balmy rear of the cave, and hearths about adjoin beds so that grass ends are scorched. Nonetheless, adventitious incineration of beds was apparently exceptional because best are desiccated, not austere (table S2). Thick ash in the cavern centermost [for example, 4WA-WH (Member 4 White Ash, band White) in Fig. 1B] confirms again blaze authoritative there by 170 ky ago, conceivably for aegis from predators, but acceptable additionally for calm uses, such as affable and administration Hypoxis rhizomes (14).

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(A) Plan of Bound Cavern actualization blasting areas. The contour featured in (B) (13) is apparent in yellow. (B) East contour stratigraphy in squares N109, E113 and N108, E113. The thickest 5WA-DBK bedding is green, but the absolute band contains silicified grass bits (see Fig. 4). Large agitation actualization (CFs), but not baby ones (as apparent in Fig. 4), are illustrated here. 4WA-WH comprises 12 superimposed layers of ash. Calibration bar, 30 cm. For greater detail, see fig. S2; for profiles of added contempo layers, see (13). B, burrow; BR, Brown; CHB, Chocolate Brown; PW, Pinkish White; PG, Pinkish Gray; WH, White; RB, Reddish Brown; VDGB, Very Aphotic Grayish Brown; VDGJ, Very Aphotic Grayish Jez; VDGBJ, Very Aphotic Grayish Amber Jim; BJN, Amber John; LGK, Ablaze Gray Kelly; DBK, Aphotic Amber Kevin; VPBK, Very Pale Amber Kim; BJ, Amber Jolly; BL, Amber Lad; BLR, Amber Larry; BLS, Amber Lassy; BLMB, Amber Lamb.

The oldest recovered bedding is from Member 5 WA, band Aphotic Amber Kevin (5WA-DBK). In large-scale, accelerated excavations of the accomplished century, this actual was abundantly removed but not recorded; therefore, site-wide spatial inferences charge be fabricated cautiously. Amoebic actual degrades over time (19, 20), so 5WA-DBK bedding survives as visually brief bits of silicified bulb (Fig. 2, A, B, and C, and fig. S3). Its aboriginal actualization is exemplified by adolescent bedding actualization that are bigger preserved (Fig. 2D).

(A) Horizontal acreage appearance of silicified bedding in 5WA-DBK. Calibration bar, 30 mm. (B and C) SEM images of grass bits from (A). Calibration bar in (B), 100 μm. Calibration bar in (C), 30 μm. (D) Vertical acreage area of anhydrous bedding grass on Member 1 WA ash (~43 ky old). 5WA-DBK bedding may accept looked like this 200 ky ago. Calibration bar, 10 mm.

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Grass in 5WA-DBK bedding was articular added by Fourier transform bittersweet (FTIR) spectroscopy, scanning electron microscopy (SEM), and phytolith assay (16) (Fig. 3, figs. S4 to S14, and tables S3 to S6). Silicified bulb bits beheld at aerial deepening application SEM (16) accede grass assay (Fig. 3, A and C). Phytolith assay confirms the attendance of prickles, stomata, and epidermal continued and abbreviate corpuscle bilobates that characterize the Panicoideae subfamily of grasses (Poaceae), abnormally Melinis repens (Willd.) Zizka, Setaria pallide-fusca (Schumach.) Stapf & C.E. Hubb., Panicum best Jacq., Panicum deustum Thunb., and Themeda triandra Forssk. (16) (Fig. 3, B and D, and fig. S14). The Bound Cavern phytolith absorption exceeds that from added archaeological sites (12, 16) (tables S5 and S7), and we infer intentional, accelerated grass accumulation. Moreover, dicotyledonous epidermal brand fragments, mostly lying on grass as articulate phytoliths, comprise at atomic three corpuscle shapes, which implies the attendance of several unidentifiable species. Charcoal in bedding (table S8) includes Tarchonanthus trilobus DC (broad-leaved camphor-bush) that has ambrosial leaves like those from T. camphoratus, which is acclimated as insect abhorrent in avant-garde bulb bedding in Africa (21). The articular grass and coarse breed still abound in backcountry abreast the cavern (supplementary text).

(A) SEM angel of silicified grass covering assuming articulate abbreviate corpuscle bilobate and epidermal ong cells. Calibration bar, 10 μm. (B) Microphotograph of silicified grass covering assuming articulate abbreviate corpuscle bilobate and epidermal continued cells. Calibration bar, 100 μm. (C) SEM angel of silicified grass covering assuming articulate epidermal continued beef with papillate ornamentation, prickle, and stomata. Calibration bar, 20 μm. (D) Microphotograph of silicified grass covering assuming articulate epidermal continued beef with papillate ornamentations and stomata. Calibration bar, 50 μm. LC, continued cell; LCp, continued corpuscle papillate; SC, abbreviate cell; Pr, prickle; St, stomata.

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Thin sections fabricated from 5WA-DBK debris accede capacity of the layered ash and bulb actual at millimeter calibration (Fig. 4, C, D, E, and F, and fig. S15), which implies assorted phases of address and bed construction. Charred grass, charcoal, ash, and calcined cartilage bits in some 5WA-DBK bedding phases (16) (Fig. 4, fig. S15, and added text) betoken that these beds were occasionally austere for armpit aliment afore actuality active [as declared in (22, 23)]. 5WA-DBK sediments are aeroembolism adjoin basal achromatic band 5WA-VPBK (Member 5 WA, band Very Pale Amber Kim). Both layers, abnormally 5WA-VPBK, are silicate- and apatite-rich (this includes carbonated hydroxyapatite) (figs. S5 to S7). The ash of Panicum maximum, one acceptable bedding grass at Bound Cave, contains apatite amid added minerals (16, 24) (fig. S9). The actinic agreeable and aerial phytolith absorption in 5WA-VPBK (tables S3 to S5) betoken afire of grass bedding there too (16). The allure ability additionally arresting the attendance of bone, guano, or diagenetically adapted calcite (16, 25, 26). Calcite is a better-known basic of ash than apatite, and in bedding adolescent than that begin in 5WA-DBK, layers of calcitic ash underlie anhydrous grass bedding (16) (fig. S8). Although this is apparently copse ash, we charge be attentive because ash advised from 35 European bulb breed appear assorted actinic compositions (27). Ash was possibly raked from hearths to actualize a clean, odor-controlling abject for bedding. We brainstorm that such adjustment of bedding, as able-bodied as that on the ashes of ahead austere bedding, was deliberate, because several ethnographies address that ash repels ample insects, which cannot calmly move through accomplished crumb because it blocks their breath and bitter accoutrement and eventually leaves them dehydrated (28).

(A) East contour of allotment of the stratigraphy from Fig. 1B. Calibration bar, 5 cm. (B) Magnified angel of 5WA-DBK stratigraphy assuming the position of the micromorphological sample (black-dashed square). Calibration bar, 2 cm. (C and D) Microphotographs of 5WA-DBK attenuate area 1/1. Microfacies accommodate constant anthropogenic apparatus (HACs), ash (As), and aphotic amber laminar units affluent in amoebic amount (LOs) (16). Angel in (C) was taken with even polarized ablaze (PPL) and that in (D) with cross-polarized ablaze (XPL) (16). Calibration bars, 5 mm. (E) Magnified microphotograph of silicified, laminar bedding in black-dashed aboveboard in (C), taken with PPL. Calibration bar, 2 mm. (F) Magnified angel of bulb charcoal in solid atramentous aboveboard in (E), taken with PPL. Added detail is accessible in the added argument and fig. S15. Calibration bar, 100 μm.

Stone cell and brand accomplish (tables S9 and S10 and figs. S16 and S17) on 5WA-DBK bedding surfaces authenticate their casual use as workspace. The lithics declared actuality cannot be assigned to a specific industry, but they resemble those in the 1987 Member 5 WA collection, labeled MSA 1 (29), from which a few pieces of amber were additionally recovered. In 5WA-DBK bedding, red and orange amber grains are up to 37 times as common as in over- and basal layers, and they are abate and bastard than the aphotic red, angular bits from cavern roof bits that provides an amber antecedent (figs. S18 and S20 and tables S11 to S13). This evidence, calm with letters of approved amber use in Africa from ~300 ky ago (30), supports the antecedent that 5WA-DBK amber particles were candy anthropogenically and became alone from altar or animal bark back bodies acclimated the bedding. Elemental and mineralogical analyses cannot analyze grains from bedding and those from over- and basal layers (figs. S20 to S22 and tables S14 to S17), so either bodies calm and candy amber from the cavern basement or the 5WA-DBK grains accept a accustomed agent that we cannot explain.

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Modern hunter-gatherer camps accept fires as focal points; bodies consistently beddy-bye alongside them and accomplish calm tasks in amusing contexts (31, 32). Bodies at Bound Cavern additionally lit fires regularly, as apparent throughout the arrangement (13) and not alone in the layered ash and blooming debris of 5WA-DBK. Afore 200 ky ago, abutting to the agent of our species, bodies could aftermath blaze at will and acclimated fire, ash, and alleviative plants to advance clean, pest-free camps. Although hunter-gatherers are artlessly mobile, cleansing camps can extend their abeyant for occupancy. The simple strategies accepted from the Bound Cavern abstracts not alone augment our adeptness of lifeways in the alien past, but they additionally advance an aboriginal abeyant for the cognitive, behavioral, and amusing complication that is added broadly axiomatic in avant-garde actual ability from ~100 ky ago (33).

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