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Trg hrvatskih velikana / Square of Croatian greats EarthCache

Hidden : 11/7/2021
Difficulty:
1.5 out of 5
Terrain:
1.5 out of 5

Size: Size:   other (other)

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Geocache Description:


Ova serija od pet EarthCachea prikazat će vam Zagreb iz malo drugačije perspektive. Na mnogim lokalitetima moguće je vidjeti geološke atrakcije, poput fosila ili vrlo zanimljivih stijena...

Trg hrvatskih velikana

Geologija

U blizini GZ-a vidimo pješčenjak.

Pješčenjak je čvrsta, klastična sedimentna stijena. Jednostavnim riječima, stijena se može opisati kao pješčenjak ako se značajan dio sastoji od zrnaca veličine od 0,06 do 2 mm. Vrlo su česti kvarcni pješčenici, gdje se značajan dio zrna sastoji od kvarca. Pješčenjak nastaje cementiranjem zrna (tehnički gledano, tzv. klasti - obično kvarc, feldspati i krhotine kamena kao što su siliciti) kitom. Ovo brtvilo je vrlo često karbonatno ili željezno. Intersticijska masa (npr. glinasta) naziva se matriks. Sastav pješčenjaka varira ovisno o mjestu pojave. Pješčenjak ima vrlo različite boje: od sive preko žute do crvene (ukazuje na prisutnost željeznih oksida), ponekad može biti višebojan.

Zadaci:

1. Opišite strukturu pješčenjaka na GZ.

2. Sadrži li lokalni pješčenjak fosile?

3. Slikajte sebe ili svoj GPS u blizini GZ.

Pošaljite mi odgovore preko profila, a zatim se normalno prijavite.

Izvori: Wikipedia

This series of five EarthCaches will show you Zagreb from a slightly different perspective. In many localities it is possible to see geological attractions, such as fossils or very interesting rocks...

Square of Croatian greats

Geology

Near GZ, we can see sandstone. 

Sandstone is a solid, clastic sedimentary rock. In simple terms, a rock can be described as sandstone if a substantial part consists of grains with a size of 0.06 to 2 mm. Quartz sandstones are very common, where a substantial part of the grains consists of quartz. Sandstone is formed by cementing grains (technically speaking, so-called clasts - usually quartz, feldspars and rock fragments such as silicites) with putty. This sealant is very often carbonate or ferrous. The interstitial mass (eg clayey) is called a matrix. The composition of sandstone varies according to the place of occurrence. Sandstone has very different colors: from gray through yellow to red (indicates the presence of iron oxides), sometimes it can be multicolored.

Tasks:

1. Describe the structure of sandstone on GZ.

2. Does the local sandstone contain fossils?

3. Take a picture of yourself or your GPS near GZ.

Send me answers via profile, then log in normally.

Sources: Wikipedia

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