Jago Cooper, curator, British Museum
At the end of May, I returned to the British Museum from an exploratory research visit to an uninhabited national park on the island of Mona in Puerto Rico. My colleague Dr Alice Samson, McDonald Institute for Archaeological Research, and I had found more than we planned or expected when we flew to the Caribbean two weeks earlier.
Alerted to the potential presence of archaeological sites dating to the pre-Columbian period (prior to AD 1492 when Christopher Columbus first arrived in the Americas) by National park manager Tony Nieves, we went to take a look. We discovered extensive pre-Columbian mining and artistic practices deep inside caves, with an astonishing abundance and diversity of new rock art including pictographs and finger-incised designs representing abstract, human and animal images.
Designs, which cover the walls and ceilings of hundreds of metres of the darkest caverns and tunnels across the island were executed by the application of pigments to cave walls, and by previously undocumented techniques such as incising and dragging fingers through the very soft, plaster-like deposit on the cave walls. This particular technique left white trails of surprising freshness, complexity and elaborateness.
Strikingly the technique also appears to have been a way of harvesting the soft deposit on the cave walls as is attested by the vigorous finger scratching across large expanses of cave surfaces in all of the sites we visited. These extractive activities, or evidence for ancient mining, rather than being indiscriminate movements, were systematic and deliberate actions leaving complex designs.
Alongside Dr Samson I’m working in collaboration with the Department of Natural and Environmental Resources and the Institute of Puerto Rican Culture to develop a project to study the pre-Columbian archaeology of the island and protect this unique Caribbean heritage. Many of the caves we explored have not been visited since guano (essentially bat excrement, a very effective fertilizer) miners working there downed tools 120 years ago, leaving the ruins of railway tracks, wagons and sometimes their initials on the cave walls.
The caves are incredibly well preserved sites, but are at very high risk of future destruction due to the soft texture of the walls and confined spaces for visitors to gain access. A glimpse of this archaeology is shown in our project gallery page.
The evidence we found not only dramatically expands our repertoire of pre-Columbian iconography, but has the potential to change understandings of past cave use in this area at this time, as well as traditional definitions of rock art.
The fieldwork discussed in this blog was consequently reported in detail at the International Association of Caribbean Archaeology in San Juan, Puerto Rico on 17 July 2013 and more information can now be found on the Antiquity Journal website. Samson, A., Cooper, J., Nieves, M. A., Rodriguez Ramos, R., Kambesis, P. N. and Lace, M. J. 2013 (Dec). Antiquity. vol 87. Issue 338 (http://antiquity.ac.uk/projgall/samson338/).”