UTRECHT MICROPALEONTOLOGICAL BUllETINS

section 6. Paracordylodus gracilis was only found in the uppermost sample,
but according to its decuded regional range, it might be found throughout
this zone.
11.2.4.12. The Pro topanderodus rectus/O~pikodus evae Assemblage Zone
Diagnosis: A conodont assemblage zone characterized by the concurrence of
the ranges of Protopanderodus rectus and Oepikodus evae prior to the first
occurrence of Oistodus lanceolatus (charts II, III and IV, fig. 15).
Description: In the small rock-section of locality 2 near Horns Udde (see
figs. 5 and 15) Protopanderodus rectus and Oepikodus evae were found
together with Scolopodus peselephantis, Drepanodus arcuatus, Pro topanderodus
longibasis and Prioniodus deltatus, the latter four species being
known from lower zones in this section. In the same sample Drepanoistodus
forceps, Paroistodus parallelus, Paracordylodus gracilis, Periodon flabellum,
Oelandodus elongatus, Scolopodus rex and Stolodus stola appear for the first
time in the rock-section near Horns Udde (chart IV). The latter seven species
were already known from older assemblages elsewhere in the area and they
were found throughout this zone (charts II, III and IV, fig. 15).
Type-locality: Locality 2 near Horns Udde (see fig. 5).
Type-stratum: A limestone bed from the upper part of member Kk2 from
which sample III was obtained (see chart IV the inset).
Remarks: This zone was primarily based on the fauna of sample III from the
small rock-section near Horns Udde (see chart IV the inset). It was subsequently
recognized in section 6 and 1. Paracordylodus gracilis is absent in
sample 7 of section 6 and in sample 14 of section 1, both were taken from
the basal glauconitic layer of member Kk 3' Drepanoistodus conulatus does
occur in sample 14 of section 1, contrary to the assemblage typical for this
zone near Horns Udde. Paracordylodus gracilis seems to end its range within
this zone (see fig. 15).
II,2.4.13. The Oistodus lanceolatus/Prioniodus deltatus Assemblage Zone
Diagnosis: A conodont assemblage zone characterized by the overlap of the
ranges of Oistodus lanceolatus and Prioniodus deltatus (charts III and IV,
fig. 15).
Description: In one sample (no. 9) of section 6 Oistodus lanceolatus and
O.papiliosus start their ranges, whereas Prioniodus deltatus and Oelandodus
elongatus occur for the last time. A similar overlap was found near Horns
Udde in the sample suite IV to 7b (chart IV). The only difference is that
Oelandodus elongatus stops before the top of the zone here. In addition,