  In this paper, we investigate algebraic and topological properties of the
Riordan groups over finite fields. These groups provide a new class of
topologically finitely generated profinite groups with finite width. We also
introduce, characterize index-subgroups of our Riordan groups, and finally we
show exactly the range of Hausdorff dimensions of these groups. The latter
results are analogous to the work of Barnea and Klopsch for the Nottingham
groups.
