Metochia B (Miocene of Greece)

Where: Greece (34.9° N, 24.1° E: paleocoordinates 34.5° N, 23.7° E)

• coordinate estimated from map

When: Tortonian (11.6 - 7.2 Ma)

Environment/lithology: marine; marl

• an environment of moderate depth, which probably corresponds to the external part of the neritic zone, or eventually to the upper part of the continental slope. The sedimentary basin had, at that time, a rather restricted connection with the open deep sea, as shown by the fact that Myctophids are rather scarce in the collected material. It should be emphasized that the Tortonian fish fauna from Gavdos exhibits a striking similarity with that from Ierapetra [5,10,16,28], where the genus Bregmaceros Thomp- son is also predominant (more than 70% of the col- lected material), whereas the genera Lepidopus Gouan and Syngnathus L. are also present.
• sediments deposited in an estuarine environment and shallow marine sands rich in Heterostegina, echinoderms and molluscs [24]. The lower part of the marine section is characterized by a high benthic/planktonic foraminifera ratio, which is indicative of a close proximity to the shore. Above the marine sands takes place an alternation of hemipelagic marls and brownish laminated beds (the so-called ‘sapropels’), which are numbered from M1 to M96 [17,20], although the Metochia B section ends with bed M 55. The upward decrease of the benthic/planktonic ratio suggests a gradual deepening [24] starting from the first sapropel level (M1), which is also suggested by the correlative replacement of marine sands by hemipelagic marls. In the lower part of the Metochia B section, five successive turbiditic sequences (M7 to M11) occur within or completely replace the laminated intervals. According to Ekdale et al. [15], the occurrence in these sequences of the ichnofossils Zoophycus and Chondrites is indicative of restricted aerobic condi- tions. This is confirmed by the abundance of plant and wood remains in these levels. The fish-fauna which is preserved as articulated skeletons was found in the lower part (M16–M22 cycles) of the Metochia B section.

Size class: macrofossils

Primary reference: J. Gaudant, N. Tsaparas, A. Antonarakou, H. Drinia, and M. D. Dermitzakis. 2005. The Tortonian fish fauna of Gavdos Island (Greece). Comptes Rendus Palevol 4:687-695 [M. Uhen/M. Uhen]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 185752: authorized by Mark Uhen, entered by Mark Uhen on 11.05.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

unclassified
  -
Rotaliina
 Nummulitacea - Nummulitidae
Heterostegina sp. d'Orbigny 1826
Actinopteri
 Syngnathiformes - Syngnathidae
Syngnathus cf. albyi Sauvage 1870 pipefish
 Scombriformes - Trichiuridae
Lepidopus sp. Gouan 1770
 Acanthuriformes - Acanthuridae
 Gadiformes - Bregmacerotidae
Bregmaceros albyi Sauvage 1880
 Myctophiformes -
"Myctophum" licatae Sauvage 1880
 Clupeiformes - Clupeoidei
Sardina ? crassa Sauvage 1880 hering
unclassified
  -
 Ichnofossils -
"Zoophycus sp." = Zoophycos, Chondrites sp.
"Zoophycus sp." = Zoophycos Massalongo 1855
Chondrites sp. von Sternberg 1833