The optimal sun angle for obtaining photographs of Martian surface features from orbit
Explore the source record for details and available documents.
Open-File Report↗
Geology topics
Joseph M. Boyce
Publications and source records attributed to Joseph M. Boyce.
A summary of relative ages of the lunar nearside maria based on Lunar Orbiter IV photography
Explore the source record for details and available documents.
Open-File Report↗
Stratigraphic studies: Part C: relative ages of some near-side mare units based on Apollo 17 metric photographs
The lunar maria formed at different times and in multiple stages of extrusion. An understanding of their evolution is essential in placing the Apollo samples in a regional context and in interpreting the regional geology of a vast part of the lunar surface.
Book chapter↗
Photogeology: Part A: relative ages of some near-side and far-side terra plains based on Apollo 16 metric photography
The materials of most light or terra plains predate the lunar maria and postdate the Imbrian event. In the vicinity of the Imbrium Basin, these materials have been called the Cayley Formation (ref. 29-3) but because of the subtle diversity of the terra plains over the near side, Whilhelms and McCauley (ref. 29-4) simply called these materials Imbrian plains (Ip). The age relationships between the light plains and the Fra Mauro Formation are of principal importance in placing the Apollo 14, 15, and 16 samples in a regional context and in understanding the transitional period between the enhanced cratering rate of pre-Imbrian time and the comparatively quiescent period of impact cratering since the generation of mare surfaces.
Book chapter↗