Found at Arqueocienciências, a Portuguese archaeology blog.
It refers to a poster (quasi-paper, in English) presented to the last conference of the IWGP by Inés López, Pablo Arias and Roberto Ontañón detailing the carpological findings in two Neolithic caves of Northern Spain, Los Gitanos (Cantabria, near the Basque border) and Aranga (Asturias, near the Cantabrian border).
Synthesis of findings:
Aranga cave (Asturias):
The Mesolithic period (stratigraphic units 4 and 3) is dated to between c. 7500-7000 cal BCE and includes mainly hazelnut (Corylus avellana) remnants but also a few instances of barley (Hordeum vulgare) and another undescribed cereal, as well and Sorbus sp. (rowan).
The Late Neolithic period (unit D) is dated c. 3350-2600 cal BCE and contained mostly barley, as well as some instances of hazelnut and one acorn (Quercus sp.)
In addition to these, it is reported in the text the presence of wild apples. Apple seeds have also been recovered in a Basque cave (Aizpea, Zapata 2002).
Los Gitanos cave (Cantabria):
Neolithic (units A4, A3 and A2) is dated to c. 5000-2600 cal BCE and included only a few instances of hazelnut and acorn, plus a single instance of Brassica sp. (genus including mustard and cabbage)
Chalcolithic (unit A1) is dated more precisely to c. 3600-3100 BCE and is still dominated by hazelnuts and acorns but already showing some instances of cereal (wheat, oat and an undetermined cereal), as well as one instance of Rumex sp. (sorrel or dock)
The authors are unsure on whether the Brassica and Rumex instances were collected for food or arrived as part of some weeding activity.
The consumption of acorn bread was reported for Northern Iberia as very common in Roman times.
It is noticeable that not a single instance of pulse was found.