This photo shows deformation of rocks resulting in folded structures--internal Earth forces can cause such geologic structures to form--geologic structures can harbour inportant energy sources and valuable mineral ore deposit.
Dates to Remember
April 24: Superposition, Anticlines, Synclines
April 25: Mountains: Topic 7 Review, page 416, questions 1-6 (for marks)
April 26: Quiz on Earthquakes, Faults and Mountains
New words:
Anticline: is a series of uparched strata with side portions (limbs) dipping in opposite directions away from the central portion of fold split by a plane called the axial plane and observed in the top (plan) view as the fold axis--an eroded surface indicates the rocks become progressively younger away from the fold axis.
Syncline:is a series of downarched strata with limbs dipping inwards in opposite directions towards the fold axis--an eroded surface indicates the rocks become progressively older away from the fold axis
Recumbent fold:a fold with the axial plane horizontal
Unconformities: erosion of a surface before another layer of sediments.
Thrust fault: when sedimentary rocks are pushed together from both sides, one slab moves up and over the other.Example: Mt. Rundle, near Banff, Alberta
Fault block mountain: a mountain make by more than one fault e.g. Sierra Range in California.
