  We consider the phenomenology of the fourth generation heavy quarks which
would be pair produced at the LHC. We show that if such a quark with a mass in
the phenomenologically interesting range of 400 GeV--600 GeV decays to a light
quark and a W-boson, it will produce a signal in a number of channels which can
be seen above the background from the three generation Standard Model
processes. In particular, such quarks could be seen in channels where multiple
jets are present with large missing momentum and either a single hard lepton,
an opposite sign hard lepton pair or a same sign lepton pair.
  In the same sign dilepton channel there is little background and so an excess
of such pairs at large invariant mass will indicate the presence of heavy down
type quarks. More generally, in our study, the main tool we use to determine
the mass of the heavy quark in each of the channels we consider is to use the
kinematics of the decay of such quarks to resolve the momenta of the unobserved
neutrinos. We show how this can be carried out, even in cases where the
kinematics is under-determined by use of the approximation, which holds quite
well, that the two heavy quarks are nearly at rest in the center of mass frame.
  Since it is very likely that at least the lightest heavy quark decays in the
mode we consider, this means that it should be observed at the LHC. Indeed, it
is expected that the mass splitting between the quarks is less than $m_W$ so
that if the Cabbibo-Kobayshi-Maskawa (CKM) matrix element between the fourth
and lower generations are not too small, both members of the fourth generation
quark doublet will decay in this way. If this is so, the combined signal of
these two quarks will make the signal for the fourth generation somewhat more
prominent.
