Amonitna fauna južnog Žumberka

undergraduate thesis

• Title (english): Ammonite fauna from Vlašić Brdo near Krašić
• Author: Fran Vidaković
• Mentor: Jasenka Sremac (mentor)
• Committee member: Jasenka Sremac (predsjednik povjerenstva)
• Committee member: Dražen Kurtanjek (član povjerenstva)
• Committee member: Blanka Cvetko Tešović (član povjerenstva)
• Granter: University of Zagreb; Faculty of Science; (Department of Geology); Zagreb
• Defense date and country: 2021-09-23, Croatia
• Scientific / art field, discipline and subdiscipline: NATURAL SCIENCES; Geology; Geology and Paleontology

Abstract

Srednje trijaska dubokovodna sukcesija na području južnoga Žumberka, istaložena u bazenu nastalom kao posljedica ekstenzijske tektonike, sadrži naslage u kojemu su pronađeni ostatci srednje trijaskih amonita. Većina je faune pohranjena u kolekciji Hrvatskog prirodoslovnog muzeja, dok su neki primjerci novi te još nisu inventarizirani. Fosili odredivi do razine vrste ili roda u ovome su radu podrobno morfološki opisani, raspravljeni i smješteni u paleobiogeografski i biostratigrafski kontekst. Također, ukratko su opisane opća geološka građa terena, litološke karakteristike stijena u kojima su prisutni fosili (vapnenci i vapneno-tufitični pješčenjaci) te mikrofacijesne karakteristike vapnenca koji čini jezgru jednog od opisanih amonita. Uz pomoć opisanih fosila te faune amonita i školjkaša Gregurić Brega provedena je relativno precizna biostratigrafska analiza. Rezultati, zajedno sa starijim podatcima baziranim na mikrofosilnom sadržaju, ukazuju kako dubokovodna sukcesije na Žumberačko-Samoborskom gorju ima stratigrafski raspon od donjeg ili srednjeg ilirskog podkata anizika (trinodosus ili reitzii amonitna zone) do vršnog dijela ladiničkog kata (neumayri ili regoledanus amonitne zone).

Abstract (english)

Deep-water Middle Triassic succession in the southern Mt. Žumberak, deposited in a basin created because of extension tectonics, contains deposits which yielded remains of Middle Triassic ammonoids. Most of the fauna is stored in the collection of the Croatian Natural History Museum, while some specimens are new and therefore still not catalogued. Fossils determinable to the level of species or genus are hereby described in detail, discussed, and placed in palaeobiogeographic and biostratigraphic contexts. Likewise, basic geologic make-up of the terrain in question, lithological characteristics of the fossil-bearing rocks (limestone and calcareous-tuffaceous sandstone), and microfacies characteristics of limestone that made up the stone core of one of the described ammonoids, are briefly described. Using described fossils, as well as the ammonoid and bivalve fauna of Gregurić Breg, a relatively precise biostratigraphic analysis was performed. Results, together with older data based on microfossil assemblages, indicate that the deep-water succession of the Žumberak-Samoborsko gorje range has a stratigraphic range that spans the interval from the lower or middle Illyrian substage of the Anisian (trinodosus or reitzi ammonoid zones), to the uppermost Ladinian stage (neumayri or regoledanus ammonite zones).

• Keywords: amoniti; biostratigrafija; subsidencija; srednji trijas; Žumberak
• Keywords (english): Ammonoids; biostratigraphy; subsidence; Middle Triassic; Mt. Žumberak
• Language: croatian
• URN:NBN: urn:nbn:hr:217:815764
• Study programme: Title: Undergraduate university study of Geology; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) geologije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) geologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-09-06 09:54:11