  Very low frequency ({\nu} ~ 1.9 mHz) quasi-periodic oscillations (QPO) have
been detected in 2 - 60 keV X-rays from 4U1700-37 using auto-correlation
function analysis of RXTE archival data. No pulsar signal was detected in the
data. Less than 0.5% of the flux from the source (3{\sigma} upper limit) is
coherently pulsed with a period between 250 ms and 40 s. This upper limit
corresponds to a pulsed flux <0.02 mJy. The existence of QPO in 4U1700-37 and
the lack of a detected pulsar indicates that the X-ray source is more likely to
be a black hole than a neutron star, consistent with recent mass estimates.
