XRS :
X-ray Spectrometer
GRS :
Gamma-Ray Spectrometer
MI :
Multi band Imager
SP :
Spectral Profiler
TC :
Terrain Camera
LRS :
Lunar Radar Sounder
LALT :
Laser Altimeter
LMAG :
Lunar Magnetometer
CPS :
Charged Particle Spectrometer
PACE :
Plasma energy Angle and Composition Experiment
RS :
Radio Science
UPI :
Upper-atmosphere and Plasma Imager
RSAT :
Four way Doppler measurements by Relay satellite and Main Orbiter
VRAD :
Differential VLBI Radio Source
HDTV :
High Definition Television
During the Apollo 15 mission, astronauts also collected samples of mare basalt near the Hadley Rille. They confirmed that the Mare Imbrium was composed of many layers of lava flows, from several to ten meters in depth. The 3D view of the TC looking at the southeast direction from the northwest clearly shows the layers of lava flows on the upper parts of the rille's wall. These layers were probably formed approximately 3.2 billion years ago.