  We use a serendipitously discovered overdensity of extremely red objects
(EROs) to study the morphologies and cumulative surface number density of EROs
in a dense environment. Our extremely deep imaging allows us to select very
faint EROs, reaching Ks=21, or ~2 magnitudes fainter than the L* of passively
evolving ellipticals at z=1.5. We find that the shape of the ERO cumulative
surface number density in our overdense field mimics that of the field ERO
population over all magnitudes down to Ks=21 but with a factor of 3-4 higher
normalization. The excellent seeing in our images (0.4" in Ks and 0.6" in R)
allows for morphological classification of the brighter (Ks<19) EROs and we
find a mix of morphologies including interacting systems and disks; the
fraction of pure bulges (at most 38%), galaxies with disks (at least 46%), and
interacting systems (at least 21%) is consistent with morphological fractions
in field ERO studies. The similarity in the shape of the cumulative surface
density and morphological mix between our overdense field and the field ERO
population suggests that ERO galaxies in overdense regions at z~1-2 may not
have had an appreciably different history than those in the field.
