Certain basic concepts of geometrical stability theory are generalized to a class of closure operators containing algebraic closure. A specific case of a generalized closure operator is developed which is relevant to Vaught's conjecture. As an application of the methods, we prove THEOREM A. Let G be a superstable group of U-rank $\omega$ such that the generics of G are locally modular and Th(G) has few countable models. Let $G^-$ be the group of nongeneric elements of G, G$^+$ = G$^o$ + G$^-$. Let $\Pi$= $\{$q $\in$ S($\emptyset$): U(q) < $\omega\}$. For any countable model M of Th(G) there is a finite $A \subset M$ such that M is almost atomic over $A \cup$ (G$^+$ $\cap$ M) $\cup \bigcup_{p\in \Pi}$p(M).