Examination of two new expanded K-T transitions and reexamination of
road outcrops near Beloc, Haiti, reveals that deposition of the glass
spherule-rich deposit (SRD) occurred within the early Danian
Parvularugoglobigerina eugubina (Pla(1)) Zone, followed by an Ir
anomaly, and 50 cm above it, a second Pd-dominated platinum group
element (PGE) anomaly. The K-T boundary is at an erosional unconformity
between the base of the SRD and underlying Maastrichtian limestone,
where an interval representing about 100-250 thousand years appears to
be missing (juxtaposition of planktic foraminiferal zones (Pla(1)) and
Plummerita hantkeninoides (CF1)). It is possible that the spherule
layers are reworked from original deposits at or below the K-T boundary.
The Ir anomaly is of roughly chondritic-type and compatible with an
impact event, whereas the Pd-dominated PGE anomaly is a more basalt-type
and compatible with a magmatic origin. This suggests a multi-event
scenario consistent with one impact followed by a major volcanic event
in the Caribbean or elsewhere.