Re: Latin c- > Romance g-, any explanation?

>Is there any explanation for the trend *c->g- present in
>some Romance words?
>1- Latin cattus > Romance *gattu > Portuguese gato
>2- Latin crupta (<crypta) > *grupta > Portuguese gruta
>3- Latina crassa > *grassa > Portuguese graxa
>
>Joao SL

Isn't this typical of Southern and Southernmost
regions of the former Roman empire? p,t,k,S >
b,d,g,Z

George