This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionVulkaanilise tuha kiht.JPG
English: 454 million years old volcanic ash between the layes of limestone in the catacombs of Peter the Great's Naval Fortress in Estonia near Laagri. The diameter of objective cover is 58 mm.
Eesti: Paekivikihtide vahel paiknev 454 miljonit aastat vana vulkaaniline tuhk Peeter Suure Merekindluse maarinde Vana-Pääsküla positsiooni käikudes Laagri asumi lähedal. Pildil oleva objektiivi katiku läbimõõt on 58 mm.
to share – to copy, distribute and transmit the work
to remix – to adapt the work
Under the following conditions:
attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
share alike – If you remix, transform, or build upon the material, you must distribute your contributions under the same or compatible license as the original.
{{Information |Description={{en|1=454 million years old volcanic ash between the layes of limestone in the catacombs of Peter the Great's Naval Fortress in Estonia near Laagri. The diameter of objective cover is 58 mm.}} {{et|1=Paekivikihtide vahel paikne