The Supernova Legacy Survey (SNLS) is an ambitious survey project to measure the redshifts and spectra of 450 Type Ia supernovae (SNe Ia) in order to measure the dark energy equation of state parameter w. Spectroscopic classification was carried out using GMOS at both the Gemini-North and Gemini-South telescopes with programs every semester from 2003B to 2008A using up to 70 hours per semester. Supplemental identification of targets was also obtained with the VLT. This work is an evolutionary study looking at the differences between the high-z spectra measured as part of the SNLS and low-z objects from the literature with a long-term goal of measuring and calibrating out any differences between the two populations. The study draws on techniques developed in two previous SNLS papers (Bronder et al. 2008 and Ellis et al. 2008) to measure the pseudo-equivalent widths (EW) of 3 spectral features - CaII H&K, SiII and MgII - in the Gemini SNe Ia spectra. A low-redshift sample for comparison is drawn from the literature and using a resilient median to create a trend in EW with rest-frame phase. We present the results from the evolutionary study and the first results from using spectral properties to improve the calibration for the cosmology.