Ferruginous Petrified Wood ID'd (with Siderite)
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This video identifies the sedimentary
This video identifies the sedimentary fossil, petrified wood (using 360 degree photography). Petrified wood forms where normally, quartz and other minerals have replaced--either most, or all--of the original tree rings and other structures. However, under anoxic conditions with a specific Ph range (such as in a swamp), a less common type of iron-bearing carbonate mineral can form--siderite. Ferruginous petrified wood may contain the minerals siderite, pyrite, hematite, and other iron-bearing minerals. Up to half of the ferruginous wood may be iron, and this sample is quite dense (heavy) for its size. Therefore, ferruginous petrified wood can contain enough iron to be considered an iron ore (although not as high in iron content as magnetite and hematite). Note: This sample was collected many years ago, in western Washington State. It is probably Eocene in age.
Petrified wood is relatively easy to identify. The tree rings, the knots, the circular core area, and even the tree bark--look very similar to modern trees. Obviously, the density of the petrified wood (containing abundant quartz) is equivalent to most common rocks--which is about three- to- five times as heavy (or dense) as modern wood (that is not petrified). However, this ferruginous petrified wood is about twice the weight (density) of most petrified wood.
Petrified wood is very durable material. It was originally deposited where trees are found today--in swamps, in sand bars on rivers, and on beaches. If tumbled in rivers or along beaches, petrified wood may be rounded by shape. Because of the tree ring-like structure--petrified wood often will split in a similar fashion as modern wood (that is not petrified). Again, petrified wood is not a true sedimentary rock. It is a fossil. But is is often included in geology classes because it is a common fossil found in sedimentary rocks.
Hello Rock People! This is Dave the Geology Dude. Identification notes are below in this text. Note that I have other videos that provide more rock identification information on my YouTube channel. It is best to try to see many examples of the same rock type--because only then you understand the range of variables that can be associated with each rock type. Also, be aware that the only way to really learn rock identification, is to have hands-on experience. This is because visual experiences alone do not show the physical properties like hardness, acid reactivity, and the range of variables that are common to each rock type. Don't forget that: Geology isn't Rocket Science--it's Rock Science! Please "like" and subscribe to this YouTube channel!
Music (YouTube Audio Library): Western Spaghetti (by Chris Haugen)
Copyright by David Knoblach, 2022. All rights reserved
Petrified wood is relatively easy to identify. The tree rings, the knots, the circular core area, and even the tree bark--look very similar to modern trees. Obviously, the density of the petrified wood (containing abundant quartz) is equivalent to most common rocks--which is about three- to- five times as heavy (or dense) as modern wood (that is not petrified). However, this ferruginous petrified wood is about twice the weight (density) of most petrified wood.
Petrified wood is very durable material. It was originally deposited where trees are found today--in swamps, in sand bars on rivers, and on beaches. If tumbled in rivers or along beaches, petrified wood may be rounded by shape. Because of the tree ring-like structure--petrified wood often will split in a similar fashion as modern wood (that is not petrified). Again, petrified wood is not a true sedimentary rock. It is a fossil. But is is often included in geology classes because it is a common fossil found in sedimentary rocks.
Hello Rock People! This is Dave the Geology Dude. Identification notes are below in this text. Note that I have other videos that provide more rock identification information on my YouTube channel. It is best to try to see many examples of the same rock type--because only then you understand the range of variables that can be associated with each rock type. Also, be aware that the only way to really learn rock identification, is to have hands-on experience. This is because visual experiences alone do not show the physical properties like hardness, acid reactivity, and the range of variables that are common to each rock type. Don't forget that: Geology isn't Rocket Science--it's Rock Science! Please "like" and subscribe to this YouTube channel!
Music (YouTube Audio Library): Western Spaghetti (by Chris Haugen)
Copyright by David Knoblach, 2022. All rights reserved
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در تاریخ 1401/11/30 منتشر شده
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