Garcia, N., Feranec, R.S., Passey, B.H., Cerling, T.E., Arsuaga, J.L., 2015. Exploring the Potential of Laser Ablation Carbon Isotope Analysis for Examining Ecology during the Ontogeny of Middle Pleistocene Hominins from Sima de los Huesos (Northern Spain). PLOS ONE 10, e0142895. doi:10.1371/journal.pone.0142895

Landing, E., Geyer, G., Heldmaier, W., 2006. Distinguishing Eustatic and Epeirogenic Controls on Lower-Middle Cambrian Boundary Successions in West Gondwana (Morocco and Iberia). Sedimentology 54, 899-918. doi:10.1111/j.1365-3091.2006.00780.x

Geyer, G., Landing, E., 2004. A Unified Lower-Middle Cambrian Chronostratigraphy for West Gondwana. Acta Geologica Polonica 54, 233-273.