Geology Reference
In-Depth Information
Fig. 9.16
A selection of fossil
specimens from studied cores. 1.
SEM image of
Pseudestherites
sp. (YPM 227690) from core 172-
X146 at 36-39 m from
top
,
Mbuji-Mayi area. 2. Light
microscope image of
Congestheriella
sp. (YPM
519557) 173-X009 at 32 m from
top
, Kabinda area. 3. Close-up
SEM image of the ornamentation
on the
left side
of the
Pseudestherites
sp. (YPM
227690) specimen illustrated in
Fig. 32A. 4. Light microscope
image of
Stanleyviella
sp. (YPM
227693) from core 172-X146 at
35.8-35.9 m from top, Mbuji-
Mayi area. 5. Light microscope
image of
Paleoleptestheria
sp.
(YPM 227707) from core 173-
X030 at 45 m from top, Kabinda
Area. 6. Light microscope image
of an unidentified actinopterygian
fish, 173-X030 at 45 m from top,
Kabinda Area. Note: specimens
in (4-6) were whitened with
ammonium chloride prior to
photography. All specimens are
housed at the Yale Peabody
Museum (YPM)
173-X009, which bears Late Cretaceous detrital zircons.
They closely resemble several loxomegaglyptid genera:
Paraleptestheria
(known from the Tertiary of China) and
Paleoleptestheria
(which has a Triassic to Tertiary range and
is known from China, Kazakhstan, Mongolia, Russia
(Transbaikal and Siberian regions), and Thailand). The simi-
larity of the two genera and the relationship of their geologic
ranges suggest that they may represent ancestor-descendant
lineages. At face value, this would make the new species
represented in the core sample the first representative of this
lineage on the African continent. However, Defretin-Lefranc
(
1967
) described a species called
Euestheria sambaensis
found near Kinshasa and Samba (on the Maringa River)
which, despite being poorly illustrated, may related to the
lineage discussed above.
A species of
Stanleyviella
was identified from a single
horizon in core 172-X146. This is an exclusively African
genus, with the genus based on material collected from a
core near Kisangani (see Defretin-Lefranc
1967
and Chen
and Shen
1985
). (Defretin-Lefrac
s
1967
) material is Late
Jurassic (Stanleyville Series), so the material from this core
in the Mbuji-Mayi area (Kasai-Oriental province) would be
the youngest know occurrence of
Stanleyviella
. Alter-
natively, core 172-X146 may actually correlate to J1 rather
than C4 as we have tentatively suggested.
Congestheriella
is known from a single horizon in the
173-X009 core (Kabinida area, Kasai-Oriental province).
The first representative of the genus was identified by
Leriche (
1913
) in material from near Lualaba, DRC. It has
since been identified from elsewhere in Africa, as well as
'
Search WWH ::
Custom Search