Name 1
THE INTERSECTION OF EROSIONAL SURFACE BETWEEN GRÖDEN ROCKS AND ANISIAN DOLOMITE
Name 2
/
ID number
002.15.Idrija
Manager / Administrator
Idrija Mercury Heritage Management Centre
Ownership
Public
Owner
Republic of Slovenia
Local / Original ID Number
261 T–1 (samples T-1/1 and T-1/2)
Type of Object
Ore deposit

Description

Short description
The sample represents the intersection of the Mid-Triassic angled erosion surface. Above the carbon slate, there is the Ladinian dolomite breccia, strongly substituted with pyrite and later the Anisian dolomite.
Measures
Length 9 cm, width 8.5 cm, height 6.5 cm.
Materials
Slate, siltstone, dolomite conglomerate
Dating
Gröden, Mid-Triassic – Anisian and Ladinian rocks
Author / Producer
/
Picture attachments
Original use
The Mid-Triassic tectonically-erosional discordance represents one of the most important structural phenomena of the Idrija tectonic system. During the time of the first erosion period in the Middle Anisian, approximately 750 m of Lower Anisian, Scythian, Upper Permian, Gröden and partially carbon layers were removed from the Idrija tectonic rift. The result of it are well-developed erosion surfaces in the pit, on which the shallow water Upper Anisian dolomite with community of typical foraminifera (microscopically small planktonic foraminifera) was deposited.
Present use
The described specimen is being preserved, secured and presented as important natural heritage of Idrija ore deposit with exceptional universal values. It represents a unique soil “archive”, as the sample was excavated in Idrija ore deposit and also stored. It also represents one of the natural features of the Idrija ore deposit. It is a part of the thematic collection “Samples of structural and tectonic characteristics of Idrija ore deposit” of the Mine Geological Collection, displayed in the CUDHg administrative premises, as a part of the Francis’ shaft.
Original location
Idrija ore deposit, III level, at the blind shaft Leithner.
Present location
CUDHg (Mining Geological Collection), Bazoviška 2, SI-5280 Idrija

STATE OF CONSERVATION

History of conservation:
The sample is appropriately preserved. Additional interventions are not necessary. Security of the premises is taken care of.
Present state
good
Necessary activities:
Regular seasonal maintenance.

DOCUMENTATION

Addresses / collections / links etc. where further in-depth information is accessible:
- Čar, Jože. Rudniška geološka zbirka: Seznam in opis vzorcev. Mercury Mine Idrija, 2003, p. 1–122, [material is kept in the CUDHg archive];
- Drovenik, Matija, Čar, Jože, Strmole, Dragica. Langobardske kaolinitne usedline v idrijskem rudišču. Geologija, 18, 1975, p. 107–155.
- Čar, Jože. Razvoj srednjetriasnih sedimentov v idrijskem rudišču: doctoral thesis. Faculty of Natural Sciences and Engineering in Ljubljana, 1985.
Submitted
Mestni muzej Idrija
Submitted by
Miha Kosmač
Date Submitted
27. 2. 2018
Date Edited
Never