Florida international university the state university of florida at miami gly4400 structural geology estimating of strain in rocks 1. a. examine fig. 2.1 which shows the shapes of deformed ooids in a limestone. measure the long and short axes of each ooid and plot one against the other on a graph. assuming the ooids to be initially spherical estimate the strain. assumptions are you making in this estimation? draw a line which you think is closest to the long axis of the strain ellipse for the whole rock. what other b. re-examine fig. 2.1 and this time use the rf/ method to estimate the strain (see note 1). this method assumes that the ooids were randomly oriented ellipsoids prior to deformation. compare your estimate of strain and orientation of the strain ellipse determined from the rf/omethod with that obtained by the less precise method is question la