In Ecuador and northwestern Peru the Andes and adjacent country, particularly on the Pacific side, are composed of at least five distinctive geologic terranes....
A 19.3 mGal (1 Gal = 1 cm/s2) positive Bouguer gravity anomaly and a broad aeromagnetic low coincide with the Tasiuyak domain of the early paleo-Proterozoic...
Eighty-eight percent of the Cambrian Sept-àles layered mafic intrusion, possibly the second largest on Earth, lies under the estuary of the St. Lawrence River....
The Niquelândia layered basic-ultrabasic complex is one of several similar Precambrian massifs that constitute a discontinuous, north-trending chain 300 km...