SOLVED:
Bingo!
The answer will come from a call to the road construction engineer.
Same as the other Spiegelwaal rocks. Probably a local source used in the construction industry. 🤓
Search for: spiegelwaal Nijmegen
www.interregnorthsea.eu
de Spiegelwaal in Nijmegen, aangelegd om overstromingen te voorkomen, is aan het uitgroeien tot een gewild recreatie- en watersportpark.
www.spiegelwaalnijmegen.nl
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Basalt near the
Spiegelwaal in Nijmegen, Netherlands, refers to the construction material used for bank protection, specifically in the form of rock groynes, barriers, and reinforcement blocks. These basalt blocks, along with asphalt, form a barrier between the river Waal and its new secondary channel, the Spiegelwaal.
Key Details on Basalt at Spiegelwaal:
Function: The basalt blocks are used for reinforcing the river bottom and banks, particularly to prevent erosion.
Location: They are present along the banks, in river groynes, and in the barriers separating the main river from the Spiegelwaal channel.
Visibility: These structures are often visible, especially during periods of low water levels, such as in summer.
These volcanic rocks are imported for hydraulic engineering projects in the Netherlands, including the stabilization of the Waal riverbed near the Nijmegen Waalkade.
River rock without specific origin. High probability with surrounding Basalt, the rocks are volcanic in origin.
With potential for intermittent and random eruptions over millions of years, it could be an interesting study!
- Geowizard