Geyer, G., Heldmaier, W., Landing, E., 1995. Arthropod Traces in the Middle Cambrian of Morocco, in: Geyer, G., Landing, E. (Eds.), Morocco ’95-The Lower-Middle Cambrian Standard of Western GondwanaBeringeria. pp. 254.

Geyer, G., Landing, E., Heldmaier, W., 1995. Faunas and Depositional Environments of the Cambrian of the Moroccan Atlas Regions, in: Geyer, G., Landing, E. (Eds.), Morocco ’95-The Lower-Middle Cambrian Standard of Western GondwanaBeringeria. pp. 47-120.

Landing, E., Geyer, G., Heldmaier, W., 1995. First African Lapworthellid: Lapworthella vandali n. sp. From the Lower Middle Cambrian Boundary Interval of Morocco, in: Geyer, G., Landing, E. (Eds.), MOROCCO ’95-The Lower-Middle Cambrian Cambrian Standard of Western GondwanaBeringeria. pp. 243-253.

Landing, E., Bowring, S., Davidek, K., Westrop, S., Geyer, G., Heldmaier, W., 1998. Duration of the Early Cambrian: U-Pb Ages of Volcanic Ashes from Avalon and Gondwana. Canadian Journal of Earth Science 35, 329-338. doi:10.1139/e97-107

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