Son yıllarda giderek artan fosil çalışmalar, geçmişten günümüze odunsu bitki çeşitliliğinin değişimini ortaya koymakta ve günümüzle karşılaştırma olanağı sunmaktadır. Çalışmanın amacı, Türkiye’de fosil odunlarla ilgili makalelerde tespit edilen gymnosperm cins ve türlerinin zamansal ve alansal dağılımını irdelemektir. Ülkemizde varlığı tespit edilen en yaşlı gymnospermler Orta Jura döneminden olup üç cinsten ikisi günümüzde temsilcileri bulunmayan Xenoxylon ve Protelicoxylon, biri de günümüzde Güney Yarımkürede temsilcileri olan Agathoxylon fosil cinsleridir. Bu üç fosil cins, Orta Jura döneminde Erzurum-Gümüşhane hattında karasal kıyı şeridinin varlığına da göstermektedir. En yaygın gymnospermler ise Oligo-Miyosen dönemine ait olup bunlar Pinuxylon, Cedrus, Taxodioxylon, Glyptostroboxylon, Cupressinoxylon, Ginkgoxylon, Juniperoxylon ve Podocarpoxylon fosil cinsleridir. Bu cinslerden bazılarının (Pinus, Cedrus, Cupressus, Juniperus) günümüzde temsilcileri bulunurken, diğerlerinin (Glyptosrobus, Taxodium/Sequoia, Ginkgo ve Podocarpus) temsilcileri Türkiye topraklarından uzaklaşmışlardır.
The fossil site in Gökçeada has a rich diversity of fossil woods. New fossil woods found in different times may improve our knowledge on this fossil site. The purpose of this study is to demonstrate the identification results of new fossil woods. After taking thin sections from three different directions of fossil woods as transverse, tangential and radial, identifications were performed. As result, Ginkgoxylon lesboense Süss was determined for the first time in Gökçeada together with re-identifications of Ostryoxylon gökceadaense Akkemik, Cryptocaryoxylon grandoleaceous Akkemik, and Laurinoxylon litseoides Süss with the new fossil wood fragments. Due to the absence of the Aegean Sea in the middle Miocene, today's islands were a permanent piece of land, and therefore, new findings also revealed that the woody flora during the middle Miocene in Gökçeada and Lesbos islands was similar. This study also showed that the genus of Ginkgo L., which is represented with only one species today in China, had a common species in the middle Miocene forests of Aegean basin.
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