Ulmener Lake - Ulmen, Germany - Volcano Watching on Waymarking.com

"The Ulmense Maar is today 420 meters above sea level, has an area of ??5.5 hectares and is 36 meters deep. That the volcanism is still active is evidenced by the bubbles on the edge of the maar. They bear witness to a swirling past - but rest assured, no eruption is in sight! A wall up to 20 meters thick of various rocks and ash surrounds the funnel."
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Geocache details ( Mitten durch den Vulkan) : (visit link)

According to the sign at the lake it is one of the first 100 geological heritages sites, according to the IUGS. The IUGS website give the following information:

"The IUGS Geological Heritage Site Ulmen Maar represents a key site for four geologically important processes that are of international relevance: (1) The maar allows introduction into the youngest volcanic activity in Central Europe. (2) It clearly shows the consequences of multiple explosive magma-water-interactions leading to phreatomagmatic eruptions. (3) The Ulmen maar is part of a maar-rich volcanic field. Here, essential arguments for the formation of maar volcanoes were developed. (4) Its postvolcanic crater lake presents a paramount insight into lake sediments and their interpretation with respect to the local weather and the climate during the maar’s lake history."
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More info here (page 79) : (visit link) - This also includes the mention that the volcano erupted 10.000 years ago.

Volcano Type: Cinder Cone Volcano Location: Submarine (underwater) Year of most recent activity: -8000 Caldera Visible?: yes Cone Visible?: no Crater Visible?: no Geyser/Hot Spring Visible?: no Lava Dome Visible?: no Lava Flow (Moving) Visible?: no Lava Flow (Not Moving) Visible?: no Vent or Fumarole Visible?: no

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