However, long-necked bottle samples that pre-date the spouted bottle were also found to contain cocoa residues.
The researchers suggested that this vessel type was inappropriate for frothing but better for pouring.
At Crossbrae, near Turriff, a thin layer of peat below soliflucted till has yielded minimal radiocarbon ages in the range of 44 000 to 47 000 BP.
A former quarry site at Kirkhill, near Strichen, revealed a sequence of tills and fossil soils interbedded with sand and gravel, including solifluction deposits (Hall and Connell, 1991).
Pockets of deeply weathered igneous, metamorphic and sedimentary rocks have survived glaciation in several parts of the region, notably in the north-east (P915447).
East of a line from Elgin to Dundee, the bedrock has been patchily but extensively decomposed to a gruss (granular sand), locally to depths of several tens of metres.
"The earliest use of cacao in Mesoamerica is likely to have been for a fermented drink," lead author Professor John Henderson wrote in the Proceedings of the National Academy of Sciences (PNAS).
The tills themselves represent separate glaciations and the fossil soils represent interglacial and/or interstadial periods that are older than the limit of radiocarbon dating (about 40 000 BP)..pass_color_to_child_links a.u-inline.u-margin-left--xs.u-margin-right--sm.u-padding-left--xs.u-padding-right--xs.u-absolute.u-absolute--center.u-width--100.u-flex-align-self--center.u-flex-justify--between.u-serif-font-main--regular.js-wf-loaded .u-serif-font-main--regular.amp-page .u-serif-font-main--regular.u-border-radius--ellipse.u-hover-bg--black-transparent.web_page .u-hover-bg--black-transparent:hover. Content Header .feed_item_answer_user.js-wf-loaded . It was drunk at important ceremonies to mark weddings and births, especially by elites.As the drink was frothy, it was served in a spouted bottle with a flaring neck.