Palynology, taphonomy and geology of the early cretaceous Dinosaur Dreaming Fossil Site, Inverloch, Victoria, Australia
The recovery of vertebrate fossils from the Early Cretaceous Dinosaur Dreaming Fossil Site (DDFS), near Inverloch, Victoria, Australia, is restricted to an approximately 1 metre thick fluvial deposit, consisting of interbedded conglomerate and sandstone units that were deposited as part of a braided...
Main Author: | |
---|---|
Format: | Thesis |
Language: | unknown |
Published: |
2017
|
Subjects: | |
Online Access: | https://doi.org/10.4225/03/58a2668bdf75b https://figshare.com/articles/thesis/Palynology_taphonomy_and_geology_of_the_early_cretaceous_Dinosaur_Dreaming_Fossil_Site_Inverloch_Victoria_Australia/4649123 |
id |
ftmonashunivfig:oai:figshare.com:article/4649123 |
---|---|
record_format |
openpolar |
spelling |
ftmonashunivfig:oai:figshare.com:article/4649123 2023-05-15T18:02:19+02:00 Palynology, taphonomy and geology of the early cretaceous Dinosaur Dreaming Fossil Site, Inverloch, Victoria, Australia Seegets-Villiers, Doris Erika 2017-02-14T02:08:10Z https://doi.org/10.4225/03/58a2668bdf75b https://figshare.com/articles/thesis/Palynology_taphonomy_and_geology_of_the_early_cretaceous_Dinosaur_Dreaming_Fossil_Site_Inverloch_Victoria_Australia/4649123 unknown doi:10.4225/03/58a2668bdf75b https://figshare.com/articles/thesis/Palynology_taphonomy_and_geology_of_the_early_cretaceous_Dinosaur_Dreaming_Fossil_Site_Inverloch_Victoria_Australia/4649123 In Copyright 1959.1/870884 Dinosaur Dreaming Fossil Site Inverloch Victoria Australia ethesis-20130611-14427 thesis(doctorate) Early cretaceous fossil sites Geology - Inverloch Palynology Restricted access monash:119318 Taphonomy 2012 Text Thesis 2017 ftmonashunivfig https://doi.org/10.4225/03/58a2668bdf75b 2022-06-06T15:49:32Z The recovery of vertebrate fossils from the Early Cretaceous Dinosaur Dreaming Fossil Site (DDFS), near Inverloch, Victoria, Australia, is restricted to an approximately 1 metre thick fluvial deposit, consisting of interbedded conglomerate and sandstone units that were deposited as part of a braided stream under high energy hyperconcentrated flow conditions. Palynological analyses of samples from this, at the time of deposition, high latitudinal site reveals a vegetation dominated by ferns, lycopods, gymnosperms and subordinate hepatics and mosses, indicative of microthermal (temperate to possible cool – temperate) settings. The palynology has also restricted the age of the site to 116.5 – 120 Ma (early to mid Late Aptian) in the upper part of the Cyclosporites hughesii Zone as defined by Partridge (2006). Comparison of the floral assemblage between sites affected and unaffected by periglacial structures has revealed only marginal differences, strongly suggesting little climatic variations during time of sediment deposition during this part of the Aptian. The DDFS lay at high latitudes in the Early Cretaceous, and there is evidence of climatic seasonality coupled with the time of onset of polar night conditions and the concomitant reduction in light availability observed in growth rings of arborescent taxa. Charcoal fragments attest to periodic wildfires brought about by the possible drying of the landscape. Homogenisation of cell walls in charcoal samples indicates that the fires occurred at temperatures ranging between 230°C to 340°C. Sedimentological evidence indicates that the skeletal elements accumulated in and around a lake environment prior to reworking. Bone modification and articulation patterns plus climatic settings support a subaerial exposure of skeletal material of several years. Partial sorting of light¬weight bone material is a result of hydraulic winnowing, most likely due to flooding resulting from heavy rain, prior to the reworking of the assemblage. The majority of bones were broken prior to ... Thesis polar night Monash University: Figshare |
institution |
Open Polar |
collection |
Monash University: Figshare |
op_collection_id |
ftmonashunivfig |
language |
unknown |
topic |
1959.1/870884 Dinosaur Dreaming Fossil Site Inverloch Victoria Australia ethesis-20130611-14427 thesis(doctorate) Early cretaceous fossil sites Geology - Inverloch Palynology Restricted access monash:119318 Taphonomy 2012 |
spellingShingle |
1959.1/870884 Dinosaur Dreaming Fossil Site Inverloch Victoria Australia ethesis-20130611-14427 thesis(doctorate) Early cretaceous fossil sites Geology - Inverloch Palynology Restricted access monash:119318 Taphonomy 2012 Seegets-Villiers, Doris Erika Palynology, taphonomy and geology of the early cretaceous Dinosaur Dreaming Fossil Site, Inverloch, Victoria, Australia |
topic_facet |
1959.1/870884 Dinosaur Dreaming Fossil Site Inverloch Victoria Australia ethesis-20130611-14427 thesis(doctorate) Early cretaceous fossil sites Geology - Inverloch Palynology Restricted access monash:119318 Taphonomy 2012 |
description |
The recovery of vertebrate fossils from the Early Cretaceous Dinosaur Dreaming Fossil Site (DDFS), near Inverloch, Victoria, Australia, is restricted to an approximately 1 metre thick fluvial deposit, consisting of interbedded conglomerate and sandstone units that were deposited as part of a braided stream under high energy hyperconcentrated flow conditions. Palynological analyses of samples from this, at the time of deposition, high latitudinal site reveals a vegetation dominated by ferns, lycopods, gymnosperms and subordinate hepatics and mosses, indicative of microthermal (temperate to possible cool – temperate) settings. The palynology has also restricted the age of the site to 116.5 – 120 Ma (early to mid Late Aptian) in the upper part of the Cyclosporites hughesii Zone as defined by Partridge (2006). Comparison of the floral assemblage between sites affected and unaffected by periglacial structures has revealed only marginal differences, strongly suggesting little climatic variations during time of sediment deposition during this part of the Aptian. The DDFS lay at high latitudes in the Early Cretaceous, and there is evidence of climatic seasonality coupled with the time of onset of polar night conditions and the concomitant reduction in light availability observed in growth rings of arborescent taxa. Charcoal fragments attest to periodic wildfires brought about by the possible drying of the landscape. Homogenisation of cell walls in charcoal samples indicates that the fires occurred at temperatures ranging between 230°C to 340°C. Sedimentological evidence indicates that the skeletal elements accumulated in and around a lake environment prior to reworking. Bone modification and articulation patterns plus climatic settings support a subaerial exposure of skeletal material of several years. Partial sorting of light¬weight bone material is a result of hydraulic winnowing, most likely due to flooding resulting from heavy rain, prior to the reworking of the assemblage. The majority of bones were broken prior to ... |
format |
Thesis |
author |
Seegets-Villiers, Doris Erika |
author_facet |
Seegets-Villiers, Doris Erika |
author_sort |
Seegets-Villiers, Doris Erika |
title |
Palynology, taphonomy and geology of the early cretaceous Dinosaur Dreaming Fossil Site, Inverloch, Victoria, Australia |
title_short |
Palynology, taphonomy and geology of the early cretaceous Dinosaur Dreaming Fossil Site, Inverloch, Victoria, Australia |
title_full |
Palynology, taphonomy and geology of the early cretaceous Dinosaur Dreaming Fossil Site, Inverloch, Victoria, Australia |
title_fullStr |
Palynology, taphonomy and geology of the early cretaceous Dinosaur Dreaming Fossil Site, Inverloch, Victoria, Australia |
title_full_unstemmed |
Palynology, taphonomy and geology of the early cretaceous Dinosaur Dreaming Fossil Site, Inverloch, Victoria, Australia |
title_sort |
palynology, taphonomy and geology of the early cretaceous dinosaur dreaming fossil site, inverloch, victoria, australia |
publishDate |
2017 |
url |
https://doi.org/10.4225/03/58a2668bdf75b https://figshare.com/articles/thesis/Palynology_taphonomy_and_geology_of_the_early_cretaceous_Dinosaur_Dreaming_Fossil_Site_Inverloch_Victoria_Australia/4649123 |
genre |
polar night |
genre_facet |
polar night |
op_relation |
doi:10.4225/03/58a2668bdf75b https://figshare.com/articles/thesis/Palynology_taphonomy_and_geology_of_the_early_cretaceous_Dinosaur_Dreaming_Fossil_Site_Inverloch_Victoria_Australia/4649123 |
op_rights |
In Copyright |
op_doi |
https://doi.org/10.4225/03/58a2668bdf75b |
_version_ |
1766172121811124224 |