According to the British Antarctic Survey's (BAS) aeromagnetic 1975 survey of Ceres Nunataks and nearby Astraea Nunatak, this geographical feature is rich in the igneous rocks Diorite and Tonalite as presumed by the rock samples which were observed by BAS during this survey.
Aeromagnetic Survey of Ceres Nunataks and Astraea Nunatak