UTRECHT MICROPALEONTOLOGICAL BUllETINS

sediment, corresponding in colour to that of the underlying bed. The basal
marly limestone (sample 80) passes upwards into brownish and indurated
limestone (sample 81). The total thickness of this unit amounts to 50 cm.
The lower boundary of the second finely laminated unit is marked by
a rapid change in colour to rose-brown. The sediment seems to be clayey;
burrowing is present but rare. Some less distinctly laminated interbeds have
a thickness of up to 4 cm. Samples 82 and 83 were collected in this 60 cm
part of the succession. At the top of the previous unit the sediment changes
into a light brown, less distinctly bedded limestone, which contains burrows
filled with white limestone of pelletoidal texture. This sediment passes in
turn into homogeneous limestone which is overlain by a laminated bed with
a thickness of 6 cm and a compact, indurated limestone of 15 cm (sample
84). The unit ends with a marly, partly laminated limestone of 20 cm thickness
(sample 85).
The undulating lower contact of the third laminated unit of rose-coloured
sediment (thickness 45 cm) is rather sharp and well traceable in the horizontal
sense. The sediment is of remarkably low weight and shows delicate
lamination with small scale undulations, draping over larger specimens of
Fig. 10 Horizontal burrows on a bedding plane in a laminated interval of the Trubi at Capo Rossello
(exposure 3).