Australian Seabed Sediments Collection

This dataset contains point data describing physical properties of marine sediments as held within the Geoscience Australia Marine Sediment database (MARS) for samples acquired by marine surveys that occurred between 1905 and 2017. Samples were collected from within the Australian Exclusive Economic Zone, plus waters within Australian Antarctic Territory, waters around Christmas Island (Indian Ocean) and outside the EEZ within the Timor Sea and waters around Papua New Guinea. Samples are sourced from a range of organisations, with sampling technique, spatial accuracy and sample preservation varying between surveys. Attributes include survey ID and name, sample ID, sampling method, water depth and location information. Sediment properties include %mud, %sand, %gravel, mean grain size and texture (classified using the Folk (1954) nomenclature for sediments). There is no consistent datum and projection due to the time span, differing collecting organisations and method of measurement across the dataset. All data is referenced to WGS 84 unless stated otherwise.

本数据集收录了1905年至2017年间海洋调查获取的沉积物样品点数据，相关数据存储于澳大利亚地球科学局（Geoscience Australia）的海洋沉积物数据库（MARS）中，用于描述海洋沉积物的物理性质。

样品采集范围涵盖澳大利亚专属经济区（Exclusive Economic Zone，EEZ）、澳大利亚南极领地海域、印度洋圣诞岛周边海域，以及帝汶海专属经济区外海域与巴布亚新几内亚周边海域。

本数据集的样品来源涉及多家机构，不同调查项目的采样技术、空间精度及样品保存方式均存在差异。

数据集包含的属性字段包括调查编号与名称、样品编号、采样方法、水深及位置信息。沉积物物理性质参数包含泥含量（%）、砂含量（%）、砾石含量（%）、平均粒径，以及采用福克（1954）沉积物分类命名法划分的沉积物类型。

由于数据集覆盖的时间跨度较长，且采集机构、测量方法各不相同，因此未采用统一的大地基准面与地图投影坐标系。除非另有说明，所有数据均采用世界大地测量系统1984（World Geodetic System 1984，WGS 84）坐标系。