Zemes un vides zinātnes Earth and Environment Sciences - Latvijas ...

106 ADVANCES IN PALAEOICHTHYOLOGY
Fig. 3. Schematic plan of the outcrop wall at the Pavāri site. Numbers in circles refer to the
numbers of layers mentioned in the text. 1, ripple marks. 2, fossil remains. 3, siltstone. 4, clay
pebbles or layers. 5, erosional surface of supposed erosional channel.
rock in the uppermost part. Judging by the poor sorting (Fig. 4, samples 8, 8A, and 8B)
these deposits were accumulated under calm water conditions. The uppermost part of
the exposed section (layers 9 and 10) is formed by white, moderately well-sorted, finegrained
and very fine-grained sandstones (Fig. 4, samples 9 and 10), probably originated
in a weak stream.
Vertebrate remains are usually represented by disarticulated plates of placoderms,
isolated teeth or bones of sarcopterygians and tetrapods. Articulated portions of
placoderm head shields, trunk and pectoral fin armour, complete lower jaws or portions
Fig. 4. Grain-size distribution cumulative curves for siliciclastic deposits of the Ketleri Formation.
Numbers refer to the numbers of layers mentioned in the text and shown in the Fig. 3.