Geological objects and structures in 3D : oberservation interpretation and building of 3D models Geologists must be able to read a geological map. That means interpreting the vertical dimension through the 2D view represented on the map and at different scales. The main objective of this book is to help students during this difficult learning process. Based on an abundant iconography (field photos maps cross sections) and on basics in mathematics and mechanics the book dissects the geometry of emblematic geological structures and objects in order to build 3 D models printable in 3D. The book is dedicated to structural geology with a particular emphasis on kinematics of faulting and folding and on salt tectonics (chapters III IV and V). The origin of continental great unconformities and oceanic break up unconformities is also discussed (chapter II). The audience of the book is broad and includes (under)graduate students in Earth Sciences professors of Natural Sciences and professional or amateur geologists