What are pinnacle reefs?
Pinnacle reefs: a stratigraphic challenge. Pinnacle reefs form within carbonate banks and adjacent slopes that straddle the interface between shallow and deep marine systems, forming a complex mosaic of different deposit types.
What types of reefs were formed around the margins of the Michigan Basin?
During the mid-Silurian, pinnacle reefs surrounded the edges of the Michigan basin. Each reef extended up, vertically, from the sea floor, some 200+ meters. They commonly are up to a km in width.
Are there coral reefs in the Great Lakes?
Reefs in the Great Lakes are made from rock, not coral. Some systems extend over miles, while others cover relatively small pockets beneath the water surface. In Northern Michigan there are four major reef restoration projects attracting DNR research and resources.
Does coral grow in Lake Michigan?
“There is no coral in Lake Michigan.”
How did the Michigan Basin evaporites form?
When the seas returned again during middle Devonian time they deposited a wide variety of Devonian sediments in Michigan, including sandstones, shales, limestones, and evaporites.
Was there ever coral in Lake Michigan?
“There is no coral in Lake Michigan.” “You’re not going to see anything in that cloudy water.
Does Lake Michigan have reefs?
Well it turns out that the Lake Michigan waters near Chicago are also home to a reef, although it has been dead for many years. Still, it is an interesting feature of the lake and scientists at Shedd Aquarium are interested in learning more about its habitat and the lifeforms it supports.
Does Lake Michigan have a reef?
Can lakes have reefs?
Reefs in the Great Lakes are made from rock, not coral. Some systems extend over miles, while others cover relatively small pockets beneath the water surface.
How old is the Michigan basin?
The Michigan Basin contains sedimentary rocks that were deposited in a circular depression that formed in Earth’s crust during Paleozoic time, between about 544 and 286 million years ago.
How do evaporites are formed?
Evaporites are layered crystalline sedimentary rocks that form from brines generated in areas where the amount of water lost by evaporation exceeds the total amount of water from rainfall and influx via rivers and streams.
Are there static reservoir models for Niagaran reefs?
– Developing Static Reservoir Models for Niagaran Reefs Search and Discovery Article #51318 (2016) 2) Core Conference (Jon Garrett) – Regional Chemo- and Sequence Stratigraphic Analysis of the A-1 Carbonate Thank You! Title A New Model for Niagaran “Pinnacle” Reef Complexes of the Michigan Basin, #51319 (2016).
What is a “pinnacle reef?
Previous studies depict these “pinnacle reefs” as tall, symmetrical towers with a random distribution of facies.
How much oil does the Niagaran reef play produce?
Niagaran Reef Play Niagaran Cumulative Production: ~500 Million bbls Oil; ~2.9 TCF Natural Gas 1,200 fields – 3,200 wells .5 c 0 u • 0 0: 0 INiagaran and Salina 30,000,000 +———————t—–=1r————+ 300,000,000 Dundee and Traverse 25,000,000 +—–‘”——–.L———f—–\\—–,’–\\, —–+
What are the depositional facies of the Niagaran reef sequence?
Within the Niagaran reef sequence, there are five major depositional facies, each with its own characteristic shallowing-upward trend. These facies include: reef core, reef talus, proximal reef apron, distal reef apron, and flank.