To CS Dubey: Below are the references I can lay my hands on, but I do have others somewhere! 1998 – Erslev (GSA Bull, July, v110, p900-915) Limited, localised nonvolatile element flux and volume change in Appalachian slates 1997 – Worley et at (JStrucGeol, v19, p1121-1135) Crenulation cleavage formation: evolving diffusion, deformation and equlibrium mechanisms with increasing metamorphic grade 1999 – Mamtani et al (JStrucGeol), v21, p711-718) Are crenulation cleavage zones mylonites on the microscale? (Chemical composition of muscovite only) Hope this helps. If you know of any others, please do let me know. What is your project? Regards, Joanie Marion _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com.