Neugrund breccia is a type of
rock consisting of
gneissic
breccia and
amphibolite
Amphibolite () is a metamorphic rock that contains amphibole, especially hornblende and actinolite, as well as plagioclase feldspar, but with little or no quartz. It is typically dark-colored and dense, with a weakly foliated or schistose ...
originating from the
Neugrund crater. Neugrund breccia is different from
Ordovician
The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era, and the second of twelve periods of the Phanerozoic Eon (geology), Eon. The Ordovician spans 41.6 million years f ...
breccia, which is found in a similar region but was formed millions of years later after a
different meteor strike.
Neugrund breccia formed during the
cementation of
meteor
A meteor, known colloquially as a shooting star, is a glowing streak of a small body (usually meteoroid) going through Earth's atmosphere, after being heated to incandescence by collisions with air molecules in the upper atmosphere,
creating a ...
fragments. Glacial action distributed
erratics of breccia throughout an area of over 10,000 km
2 surrounding the impact site.
Boulders of Neugrund breccia can be found in north-western
Estonia
Estonia, officially the Republic of Estonia, is a country in Northern Europe. It is bordered to the north by the Gulf of Finland across from Finland, to the west by the Baltic Sea across from Sweden, to the south by Latvia, and to the east by Ru ...
and are especially concentrated around the island of
Osmussaar.
The largest known Neugrund breccia formation is Skarvan. It is located near the west coast of Osmussaar.
File:Skarvan, Osmussaar.jpg, Skarvan
File:Rahn Estonia KLO1000558.jpg
File:Osmussaar30.jpg
File:Bretsa Osmussaar.JPG
File:Gneissbretša 1, Osmussaar.jpg
References
{{Reflist
Breccias