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It may take me a couple days to complete this review. It is not necessary to wait for me to finish my notes before you start updating. All of my comments are up for discussion, please don't feel like you have to accept every recommendation I make. Once complete, I'll be using this review to score points in the 2018 wikicup.
Is it well written?
A. The prose is clear and concise, and the spelling and grammar are correct:
Lead
"1,100-1,000 years ago" is it standard to list the higher number first? I know it is when using BC dates, but it seems counterintuitive when it's an age estimate.
I think it's usually oldest to newest per MOS:DATERANGE.
"Lassen Peak, and form " - comma not needed, form should be plural
Fixed.
" typically drying " - this is fine as is, but I think it would read better as "and typically dries"
Changed.
"flattened the forest] " - stray bracket needs to be removed
Fixed.
"numerous tree, plant, and animal species" - trees are a subset of plants. Is there a reason to set it apart?
Fixed.
Geography
"Crags Lake,[8] or the Chaos" - comma not needed
Fixed.
"cool temperatures near the shores, but grows colder " - I think and would fit better here than but, since cool and colder are similar.
Fixed.
Geology
"Between 385,000 and 315,000 " - same question as lead. The featured article Mauna Loa gives the lower number first in the "__ and __ years ago" format.
Same response as above. I think the way I'm doing it makes more sense, but open to change.
"The entire Lassen volcanic center did not erupt between 190,000 and 90,000 years ago." - this sounds off. I suggest "Beginning 190,000 years ago, eruptions ceased in the Lassen Volcanic center for 100,000 years." or something similar.
Changed.
"dome field,[16] and the youngest " - comma not needed
Fixed.
"The domes were produced about 1,100 years ago,[14] starting with.." - suggest "The domes began forming about 1,100 years ago in a process beginning with..."
Changed.
"activity,[16] which created unstable " - I think this would read easier if the sentence was split after activity and This was substituted for which.
Changed.
"similar to recent eruptions at the Mono–Inyo Craters" - Is this comparison needed? Unless readers are familiar with the eruptions at the Mono-Inyo craters, this doesn't add to the material. If you keep it, you should specify what "recent" means.
Clarified (most recent).
"eruptive phase also resembled the Lassen Peak eruptions in May 1915" - like the Mono-Inyo eruptions, I'm not sure how helpful this comparison is. If you keep it, the word also isn't needed.
These are fairly well known eruptions, and took place at the nearby Lassen Peak volcano. Got rid of also.
"violent eruption,[14][18] producing" - I think "eruption that produced" would read more smoothly
Changed.
"Eruptions within the Lassen center, at least the..." - suggest "The Chaos Crags event may have been fed by the same reservoir of crystal-containing magma as the 25,000BCE and 1914-1921 eruptions at Lassen Peak, based on [the evidence]."
Changed.
"dated to about 1,125 ± 15 years old" - Does the 1125 figure account for the age of the 16 year-old source? Why not use a year instead of an age?
I don't see why it makes a big difference. I'm not sure what you're suggesting I change.
Chaos Jumbles
What did you mean by this comment?
"transformed the area" this phrase is repeated twice in the first paragraph. I think the second instance can be removed without losing any meaning.
Removed.
"The Chaos Crags are monitored" by whom?
Updated. The direct source doesn't say, but all the monitoring for such volcanoes seems to be conducted by the USGS and subsidiaries.
Ecology
no concern
Human history
"As of 2011, they cost" - dated. If current prices aren't available, I suggest "When the cabins reopened, they cost"
It seems odd that the Human history section doesn't make any mention of Native Americans. Did any tribes live in the area? Did the crags have any significance to them? If there's no available information, that's ok.
I haven't seen anything yet that suggests they held particular importance to indigenous peoples.
