I meant to add during the workshop, that you can look at the Leslie et al. (2015) data with Earth science subgroups in mind. Some are closer to physics, others to life sciences, and yet others to chemistry. This article is a bit dated, but it shows the gender breakdown by subdiscipline within Earth sciences:
http://digitalcommons.unl.edu/cgi/viewcontent.cgi?article=1074&context=ge...
Subdisciplines that are more quantitative (geophysics, atmospheric sciences, etc.) tended to have worse ratios of men to women, at least at the time of this Eos article in 2003. Trends are for more women overall in Earth sciences, so do not take these percentages as reflective of today. However, the relative percentages may not have changed much. If you find updated info, please post!