| | EXHUMATION AND PROBABLE EXTENSION IN THE HELGELAND NAPPE COMPLEX, UPPERMOST ALLOCHTHON, CENTRAL NORWAY (Site not responding. Last check: 2007-10-16) |
 | | Within the Velfjord-Tosen area, the HNC can be divided into lower and upper nappes consisting of Proterozoic partially migmatitic gneiss, calc-silicate, and marble, and a middle nappe consisting of Ordovician ophiolite sequences and unconformably overlying medium- to low-grade metasandstones, metaconglomerates, and metacalcareous rocks. |
 | | Amalgamation of the HCN occurred prior to emplacement of the 448 Ma Andalshatten pluton that is interpreted to truncate thrust faults associated with nappe formation. |
 | | New mapping along the boundary between the lower and middle nappes in the area has recognized the presence of asymmetric folds and outcrop-scale asymmetric structures (S/C, porphyroclasts) that suggest top to the southeast sense of shear along shallowly east-dipping shear surfaces. |
| gsa.confex.com /gsa/2001NE/finalprogram/abstract_2686.htm (447 words) |