The Late Proterozoic/Early Palaeozoic Gariep Belt was formed during the Pan-African orogenic cycle and is believed to be part of the southern .coastal branch of the extensive Damara Orogenic Province, linking with the Saldanha Belt of the southwestern Cape Province. It consists of an eastern para-autochthonous passive continental margin on the western edge of the Kalahari Craton, the Port Nolloth Zone (PNZ), and a western allochthonous ophiolitic terrane, the Mannora Terrane, thrusted on the PNZ at the Schakalsberge thrust. The sedimentary rocks within the PNZ rest with a marked unconformity on the igneous rocks of the Namaqua Metamorphic Complex basement rocks of the Namaqua and Richtersveld provinces. The Gariep Group is stratigraphically subdivided into the Stinkfontein Subgroup, comprising the Rosh Pinah and the Gumchavib Formations, which are both interbedded with amphibolite sills of the Gannakouriep dyke swarm; the ‘Hilda Subgroup, comprising the Pickelhaube, Obib Peak, and Numees Formations; as well as the Holgat Subgroup, a deep-water phase, which will not be described here. Some sediments of the Rosh Pinah Formation contain bimodal volcanics and sedimentary-exhalative Zn-Pb-Cu-mineralisation. The present study has recognised the following facies associations from which palaeoenvironments have been interpreted: (1) a conglomerate/sandstone/mudstone/carbonate facies association, which was deposited as subaqueous fan delta deposits within a lacustrine environment and is restricted to the Rosh Pinah Formation; (2) a mixed sandstone and conglomerate facies association, which generated in a proximal to distal braided plain environment, being confined to the Gumchavib Formation, Obib Peak Formation, and the Numees Formation; (3) a quartz-arenite, conglomerate, and mudstone facies association, whir.h formed within foreshore, shoreface and offshore palaeoenvironments, confined to the Gumchavib Formation; (4) a calcareous facies association, which is interpreted as being deposited within a shallow to moderately deep carbonate shelf environment, being confined to the Gumchavib Formation and Pickelhaube Formations; and (5) a diamictitic facies association, interpreted as being generated in glaciomarine and glaciofluvial palaeoenvironments, which is confined to the Numees Formation. The regional structural pattern is characterised by three phases of deformation. The tectonic grain of the study area is north-northwest to northwest, comprising thrust faults, and medium to large scale, symmetric to asymmetric, tight to isoclinal, and in places recumbent north-northwest-trending D2 folds. These are refolded by small- to large-scale, open D3 folds, with fold hinges trending west to southwest. Three phases of deformation have been recognised. D1 consists of a bedding-subparallel fabric and associated small-scale isoclinal folds and sheath folds with a southeasterly vergence, which are deformed by folds, containing an axial planar fabric (D2 ), which were subsequently refolded by the D3 folds, to form interference fold structures. Lithologies, structural styles, and time-sequence of events indicate a tectonosedimentary evolution which involves the genesis of a rift and subsequent spreading of the Late Proterozoic Adamastor Ocean. The collision following oceanic closure resulted in progressive evolution from the D1 fabric and fold elements to the D2 folding and thrusting and a final D3 sinistral lateral movement. Geothermometry and geobarometry indicate P-T conditions ranging from greenschist facies to the lower amphibolite facies. The resulting geothermal gradient for these P-T estimates is about 20°C/km indicating a Barrovian-type metamorphism. The tectonosedimentary evolution of the PNZ started between ~920 Ma, which is the age of the Richtersveld Complex being unconformably overlain by the Stinkfontein Subgroup, and ~780 Ma, which is the age of the intrusive Lekkersink granites, representing a minimum age for the Stinkfontein Subgroup. The tectonosedimentary evolution of the PNZ terminated at ~520 Ma, which is the age for the Kuboos pluton and the Bremen Complex, which intrude the PNZ in the Richtersveld.